If the buyer got a loan from a traditional lender to get to the 75k number, would that automatically put me in a second position on my seller financed note?

No need to write anything more, as your brain will automatically infer that prices in Panama City should catch up with that of the other two cities.

That loan will have some bank hand-holding that people dislike (annual reporting requirements for the first few years, all rent checks must get deposited into an account at that specific bank so they can see it coming in and have an automatic "early warning signal" if they drop off, etc), but hey in their case I'd say it wasn't unwarranted, their only track record is that of mismanaging after all. 

You have to hope for 11% and my return is automatic and locked in, because it's savings on interest that's already scheduled.

However as a rule we have a baseline credit score (620) if they are below that- all applicants for the home combined, then we automatically require a double deposit (or higher deposit if double isn't allowed in your state).

You will know automatically if the lender is trustworthy based on client remarks and closings. 

I don't have Engelo's phone number, and the last time I emailed him, I got an automated robot reply.

Now property management takes little to no time and rent is deposited into our account automatically.

What I can say is that RentRedi is a complete management service that manages the entire process from marketing for tenants, through pre-qualification, scheduling viewings with calendly.com, the application, the background check/credit check/eviction check; automatic rent collection, repair/maintenance management: the whole nine. 

You did not mention AI robots will kill us all and take over the world anyways