@Arya Chen despite limited reversal in a few select markets with oversupply, the general demand for this product type is very high, leading to lower cap rates that likely won't change much in the near term.

That severely limited the number of lenders I could go to, so I ended up finding a loan product (that costs a premium, albeit) thru Velocity Capital Mortgage that allows fully-amortizing or IO payments (for first 10 years) which will help me build cash flow and accrue title seasoning while I find the right time to pull the trigger on a fully-amortizing DSCR product Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

Rates have improved for these loan products as well.

I’ve used it for projects and think it’s great for high ticket sales coaching and information based products. 

If you are using a purely investment driven DSCR product you shouldnt need transcripts at all, ever.

You listed two but in broader terms financing (assumable, owner financed, sub to, fha, new 95% OO LTV that in most ways is superior to FHA, dscr, F/f conventional, NACA, VA, etc), value adds (development including ADU, upzoning, traditional rehab, sophisticated value adds that leverage localized rules, coop/tic, etc),  property types (residential, commercial residential, land, storage, MHP, industrial, office, camping, hotel/motel, etc), passive/active investment methods (GP, LP, REIT, nnn, self managed, pm, flipping, mineral right, lumber rights, etc), residential rent models (LTR, STR, MTR, rent by room, student housing, arbitrage, etc).  

Are there other loan products similar to the DSCR loans that can also be utilized for investment properties?

It will sell mores easily and be a safer product.

My GC primed and painted over them a few times thinking they were just old, stubborn stains that needed extra product, but they kept coming back after each rainfall.I hired a water intrusion detection company to help me pinpoint the problem - they said the new roof seemed solid and that based on infrared and temperature readings, the moisture is coming in from the partition walls.

It's very possible your broker is limited in the products they have available for you.