I would keep buying 2-4 units until you max out your DTI and then switch to looking at larger units as well (take advantage of the low interest loans while you can and build a track record for commercial lenders). 

I pumped in an additional $5k (not mentioned initially) and the project is on track to be 80% complete by the end of Sep 2021. 

When I jumped from single-family to commercial I spent a year of fairly intense mentoring under a paid coach and it fast-tracked my new direction.

You will also want to create a P&L and keep track of all expenses. 

I am currently on track buying about 5-6 STR's to hold per year because of this. 

It seems like a lot but each member of the group brings their special knowledge and skills to make sure you're on track.  

Best to have a more detailed discussion with your accountant and share with them all your income/expenses if you track them in a spreadsheet or somewhere.

I couldn’t imagine trying to track all this down from the various departments in different areas, as an agent. 

Welcome to the forums and seems that you are on the right track with where you are heading.

Seems the dirty little trick and lazy method of debt collection is to report the credit bureau straightaway...I mean why not handle more accounts and collect on more accounts instead of wasting time picking up the phone, emailing, or otherwise tracking me down?