Typically Conventional will end 42% of DTI and FHA can get up to 51% DTI (and based on your credit score I think you should stretch to that 51%) Just a few things to start thinking about as you are working through the process. 

Sounds like if I stay conventional then my best rates will no doubt be the 25% down options. 

Once there is enough equity, you can refinance it on a DSCR or Conventional loan so you can use your VA entitlement again to purchase your SFR.

9) adding multiple ADUs or adding an ADU to a quad looses F/F conventional financing.

Also there is no restriction on acquiring conventional loan on primary residence even if you have maxed out on conventional loan for rentals.

Conventional financing How did you add value to the deal?

They are inherently more expensive than conventional financing and each DSCR LENDER has their own guidelines. 

Conventional How did you add value to the deal?

Conventional Investment loan.

Fix it before the next month.These are mostly conventional loans.