My goal is to steadily complement my current income, and eventually move into real estate in some capacity full-time.I started by listening to some old Ron Legrand cds (from 2004ish).

I’ve worked with new investors who were in the same position and helped them think through ways to maximize profit while growing steadily.

Steadily is a great option. 

Here's some reasons why...When you factor in what the new annual taxes will be on most of these properties, that haven't transacted in 5+ years, you're going to get nailed with a huge tax bill.Property insurance has risen drastically the last 3-5 years.Maintenance & repairs costs have gone up significantly in the last 3-5 years. 

My salary is about $70K, with overtime and raises steadily in the future.

have you checked out steadily?

The market appreciation has slowed (steadily climbing but nothing like it was) and so many of my properties were purchased for $50-65k...

In Japan, however, the value of properties generally depreciates to 0, like the value of cars do, except if they're collector's items plus the population is steadily decreasing so not the best way to create wealth.

Nashville is an all-weather economy, growing steadily (Eisen).

And since the issue here is that interest rates have risen dramatically since those loans were originated, they probably would get rid of the prepayment penalties on such loans if they could redo them.