What other methods are investors using to find Rent to Own buyers who have cash but need time to fix their credit? 

Whichever method you use is your choice and preference, but this is where the automation typically starts. 

My main concern about keeping HELOC funds sitting in a property is the interest rate is variable and your putting cash flow at risk.  

I haven't had to deal with that before, which is why I'm so concerned.

Your concern should be that you will never rent a 4 bed apartment with no living room to a 4 bed voucher.

We used the basic "Four Square Method" video to determine costs vs income.

I imagine the vacancy rate is reasonable, but the very small town was a concern (and still is) and it wasn't going to be very efficient for my team to operate there so I did not pursue that deal from 2 years ago.

The BRRRR method is great, but I am a bit confused as you seem to be talking about doing it with your current house. 

May seem like common sense, but obviously fraudulent lenders are looking to prey on people that may not be familiar with the financing methods of investment properties (newbies), or have no other financing options. 

Something like putting in a offer of $140k and will beat any other offer up to $150k with verifiable proof of offer.”Does anybody recall this method or the particulars?