Some states the duty to be performed could be as high as not protecting from injury, it could be, now that would be rare, most likely would be not warning of a hazard which caused injury.  

Not sure of your current terms, but rates are pretty low right now.Honestly, it seems from the post that the PM is performing as required.  

Here you are evasive to submit past performance of the properties you sell.  

It might be Monday morning coaching, but I bet a review of their application information will reveal a clue or two. 

SFR may be the best bet.

I know this form of marketing is effective, but I'm guessing I probably didn't perform it correctly which cost me a lot of time and some money.

Based on their performance in your visit, you can avoid them in the future, win them over to work for you or you can be annoyed.  

The best bet might be contact local management companies, they should know the market well.

Since you have currently performed on your debt, they should understand that you are relatively low risk and that they should want to help you succeed in the long term as well.

You need to ensure that your tenant-buyer can actually perform, they may not take the option but taking their money when they have no hope of meeting the terms can backfire on you as predatory dealing.