The "FNMA homeslye" loan has the same stipulations.

Most of us lenders are concerned with Loan-to-Cost and As-Completed-Value (like ARV in flips).

Right now I'm all about ASSUMABLE loans.

As a current Mortgage Loan Officer, I'll tell you this: you're not crazy. 

The dislike of FHA loans, particularly by experienced realtors who represent the seller, is twofold: FHA loan appraisals are more aggressive in the "nitpicky-ness" of relatively minor cosmetic issues, and buyers with FHA loans tend not to be as financially sound and reliable as other loan programs. 

The cash-out loan LTV is based on the appraised value.

Does anyone have experience or know of someone who was able to obtain a DSCR loan with the seller carrying a second mortgage?

Quote from @Ray Petteway: I have a commercial loan and already extended it .  

@Kevin CarpenterI typically use Batch Leads to cross reference all the properties currently on the MLS to quickly determine the loan types on listings.

I feel it depends on your current situation or project, if you're seeking a loan for fix and flip then it should be short term while Brrrr is for a longer terms due to renting , I try to balance the two with the help of a PL