I am looking to keep them on, so long as they are open to changing processes, and marketing.

Personally, when I see numbers like those given, I start questioning assumptions and class treatments so I can rule out the alternative if possible.

Making sure the property "flows" outside is a key component I have personally found - assuring nobody is stepping on toes, encroaching on each other's outside space, or blocking cars in, etc. 

It is good practice in assessing STR potential and performance by combining personal research and rental experiences (rates and dates) with at least one local reputable Property Management company rental revenue estimate. 

I personally have not seen any lenders go lower than that.

Lender will use the middle score of whichever persons score is the lowest.

I've made several attempts to personally deliver a five-day notice but haven't been successful.

Would anything happen if I just collected the money to pay the mortgage with no real book keeping?

I think this is a personal choice based on your investing appetite. 

) then keep them.