A year in with several months of vacancy on your first property is a rough way to learn this business, and the fact that you're asking diagnostic questions instead of panic-selling tells me you'll be fine. But let me answer what you actually asked, in order, because you asked six specific things.
How long before I'd question the leasing company. Sixty days on a 2-bedroom duplex in a market the size of Memphis is where I'd stop accepting narrative and start requiring data. You're past that. Questioning them doesn't mean firing them, it means the burden of proof shifts. "The market is slow" is a conclusion, and your PM has to earn it with numbers rather than assert it.
What to ask for, and I'd send this as a written list. Listing views by platform. Inquiries received. Inquiries that converted to a scheduled showing. Showings scheduled versus showings actually completed. Written feedback from each completed showing. Applications started, applications submitted, applications denied and why. Average response time to a new inquiry. The application fee, whether every adult pays it, and the average turnaround from submission to decision.
Then ask for the live links to every platform where the property is posted, plus the full photo set and the listing copy as they published it. Don't accept a list of platform names. Get the actual URLs and open every one of them yourself.
Look at your own listing like a renter would, because this is where I'd bet the problem is hiding. Most owners have never seen their own listing, and the marketing is frequently the weak link nobody thinks to check. Start with the lead photo, because that single image decides whether anyone clicks at all. It's routinely terrible: a dim living room, a bathroom, a bad exterior shot in overcast light. It should be the best-looking, brightest room in the property. Then count the photos and check whether the property was shown empty. An empty 2-bedroom is very hard for a renter to picture themselves in, and virtual staging costs very little (or nothing if you can leverage AI) and can result in an enormous difference in click-through. Check whether the rooms were shot in daylight with the blinds open. Check whether the copy actually sells anything or reads like a spec sheet. Check whether the listing is buried on page four when you search your own zip and bedroom count as a renter would. If the answer to most of these is bad, you don't have a pricing problem yet, and you'd be cutting rent to solve something a photographer could fix for a few hundred dollars.
You can also pay for listing boosts/to be featured on the various platforms. A lot of times I have found that PMs list using a service, and then forget to check some platforms, so it is not on as many platforms as you think it is. You can also google the address and pull the listings yourself to see what a lead would see.
Reduce or hold, and here's where I'd push back on the whole thread's premise. Before you cut the rent again, remember what you bought this property to do. You're refinancing. The lender is going to underwrite the income on that lease, and a permanently lowered rent lowers your DSCR, your loan proceeds, and the value the appraiser lands on. A rent cut is not a one-time cost. It follows you into the refinance and then into every renewal after that.
So use a move-in special instead. One month free spread across a twelve or thirteen month lease, or half off first month's rent, or a reduced deposit, or the application fee waived, or the first few months of lawn care covered. A prospect comparing your duplex to four others reads "first month free" as a bigger win than $75 off the monthly, and your lease still reads at the full rate when the lender looks at it. Put the special in the headline of the listing, not buried in the description. This is the highest-leverage move available to you right now, and if your PM hasn't suggested it, that's information about your PM.
If you do end up cutting the rate, run the vacancy math rather than debating the number. Take the proposed monthly cut, multiply it by twelve, and compare it to one more month of full carry. It's rarely close. But try the concession first, because it costs you the same money once and doesn't cost you the refinance.
How to pull your own comps, which also answers your Memphis question. I don't operate in Memphis, so I can't tell you what tenant demand looks like there. Here's how you find out yourself in an afternoon.
Go to Zillow's rental section, search your zip code, and filter to 2 bedrooms, houses and multifamily, in a rent band running from roughly 20 percent below your ask to 20 percent above. Do the same on Apartments.com, Rent.com, and Facebook Marketplace, because different inventory shows up on each. For everything still listed, note the rent, the days on market, and the photo quality. Zillow shows days on Zillow on the listing page, and you can also see a price history if they've cut.
The number you actually need is what's leased, and that's the harder half. Three ways to get it. First, ask your PM outright for recently leased comps with the rent they actually leased at rather than what they were listed at, since a licensed manager can pull that. Second, when you interview those other Memphis companies, ask each of them what they'd list your duplex at and what their last three 2-bedroom leases in that zip closed at. Third, and this is the low-tech version that works, save the links to every active 2-bedroom comp today and check them again in three weeks. The ones that disappeared, leased. The ones still sitting, didn't.
That count is your answer. If almost nothing in your zip has leased in sixty days, your PM is telling you the truth and this is a pricing and patience problem. If comparable properties are leasing and yours isn't, the market is not your problem, and now you know it rather than believing it.
Getting eyes on it that aren't your PM's. You're asking the people responsible for leasing the property to diagnose why it isn't leasing, and that arrangement rarely produces the answer you need. Pay a local inspector, a leasing agent, or a friend of a friend a couple hundred dollars to walk both sides and shoot a narrated video with the date visible. Have them open closets, run the water, stand in the kitchen and describe the smell, then walk out front and pan down the street. Photos hide odor, they hide the neighbor's yard, and they hide how a room feels at four in the afternoon.
Then call your own listing from a number nobody at that company has ever seen. Be an eager tenant who wants to see it this week, and time the callback. A prospect who waits two days has already applied somewhere else and will never tell you why. Do the same with the application: find out the fee, whether every adult pays, the published criteria, and the days to a decision. In a saturated market a three-day approval loses to a same-day approval every time, and renters with options don't gamble sixty dollars on a maybe.
On the trip: you already thought this through and decided it isn't practical right now, and that's a reasonable read of your own finances while you're carrying the property. I'd sequence it. Listing review, comps, and video first, because all three are cheap and you can have them this week. If those come back clean and it still isn't leasing, the trip becomes the highest-value thing left, and at that point I'd go.
Changing managers. I wouldn't fire anyone over a vacancy. I would interview five other Memphis companies this week regardless. Ask each what they'd list your duplex at, how fast they turn an application, where they advertise, what their average days on market ran last quarter, and whether they work with voucher holders. You cannot call one company, get all your answers, and decide that's the right one. Every answer any single one of them gives you is an opinion, and the contrast across five is where the truth lives. If your current PM's story stops matching what the other four tell you, you have your answer without needing to be certain about anything.
Other strategies before you'd ever consider selling. Ask your PM directly whether they're marketing to voucher holders, and if not, why not. Check the payment standard for your bedroom count in your zip against your ask. I don't know your numbers so I won't predict what you'll find, but it's free to check and the answer to "why not" tells you plenty either way. Beyond that, put $10 a week behind a Zillow boost yourself and post the property yourself on Facebook Marketplace with your own photos and your own copy. Even under full professional management, do your own advertising. You might be one of three hundred properties on their list, and nobody cares about your vacancy the way you do.
There are a lot of rental programs out there for less "desirable" tenants that are not section 8. They often will subsidize the rent, so the tenant pays part, and the organization pays the balance and secures the lease on their behalf. That way a landlord has more protection for renting to someone that might not qualify otherwise.
On pausing Knoxville. Your instinct is right and I'd hold that line, but give it a deadline rather than leaving it open. Thirty days to run all of the above, then decide with information instead of with frustration. This is a leasing problem, and leasing problems resolve in weeks once you can see them clearly.
You offered to share your numbers, so I'll take you up on it. Is one side of the duplex vacant or both, and can you post the listing link? That changes your carrying math, your urgency, and how far I'd move on the special.