The doctor found out that I was going to visit those 10 to speak in person with the borrowers and try to decide on the best course of action.  

You can always pick those up after the lease ends via a judgement in court - you will have the same odds of collecting unpaid rent (close to 0).Sometimes we take it personally when folks do stuff like pay late every month - landlords live longer when we learn to not take things personally.

Personally I’d have them start saving up and get traditional financing and pay you off.

We charge one month's deposit as standard with new tenant move ins.

That generally means there is one person whose sole job is to respond to you.

STRs that I could use for personal use (family vacations) once or twice a year.  

Put an enclosure around it, heat it when necessary and  call it an indoor pool.My next personal house is just going to have a smaller pool like one of these.

I did not have standards to hold them to.

However from my observations the squatter occupied properties tend to be in lower barrier markets and I wouldn't personally want to spend my time and effort trying to create value in such neighborhoods.

Yeah, that does not sound like a standard process.