Any general feedback or suggestions for improving house management and renter accountability?

Dig into every expense, analyze the comps in detail, and stress test it based on high, medium, and low performance using percentiles.

Making sure to join a really good team with top performers will make a big difference. 

That it needs reno, or holds improvement potential.

Why don't you try and put it on furnished finder and see how it performs as a 30+ day furnished rental?

If you can buy below market value, then put in modest improvements (paint, flooring, fixtures, maybe some minor updates on kitchens or baths), you can often increase rents enough to improve cash flow meaningfully.

You can (and did) receive generic advice, but it is not enough if your goal is to be audit-proof.Things you may be missing:- before counting hours, you need to pass material participation for each of the activities (or group of activities)- there are two different groupings of activities, and you may need to combine both- targeting 750 hours is very unsafe, you need a significant cushion- driving hours have been treated by courts both ways, so you cannot rely on them to pass the test- a helpful informal way to look at hours: if someone else was performing the tasks that you want to count as REPS hours - would you pay them for these hours?

Cosmetic improvements and new appliances.

Yard improvements: New grass and sprinkler system, and flower garden areas.

My best performing property only had a 51% occupancy rate last year, but the nightly rate for when it is booked is fantastic.