They have accused me of endangering their child because of a poorly functioning AC unit, the cause of which was from them failing to change the filters for 45 days. 

I'd try to tack together a combination of 3-month or 6-month stays to get it filled. 

They have all kinds of locks that are electronic and Bluetooth functions now days.  

Andy’s IRC 415 limit is based on 20% of the combined income of $10,000

You can go through may tenant combinations to the point even where non of the originals remain and you do not return any deposit until the last tenant leaves. 

Is it possible to combine these two strategies and how can I make this work? 

It all starts there.. with the right combination of motivation, persistence, and tenacity, the rest falls into place.Thanks for the great read!

I've never heard of them, and just saw their website for the first time, http://riesiggroup.net/Their website seems legit, they seem to be a group that combines investor funds and simply invests in local real estate around the Lexington area.  

It's a function of free market.

If you are holding I advised to keep what you have and spruce it up as long as they are functional.