Are there any other considerations I should take into account for this method?

Take some time to decide what is best for you both, as one method will fit your goals/preferences/location better than the other.

A great deal only solves a few money problems.

I've had such a terrible time with all this, that I just created my own software to solve the problem. 

Basically, increasing your leverage means to take on more debt/loans.The BRRR method is usually associated with increased leverage, i.e. more loans. 

However I am extremely committed to this and would like to move into mastering the BRRRR method and learning that portion of real estate investing.

I am not an attorney, but at a minimum, you're going to need (1) adequate property insurance, (2) a standard lease agreement, (3) a method for vetting tenants/doing background checks, (4) a method for collection of rent, and (5) possibly a license for the property to be operated as a rental (you will have to check the requirements in your jurisdiction).

Any tried and true methods? 

I also heard investors don’t like personal checks because tenants might say “it got lost in the Mail” let me know your methods!

Or maybe they are simply removed as a lead, left on "the list" getting normal monthly newsletters, communications, etc.As long as their is a method to the madness, this is progress in my opinion.