White is also still popular in flips due to buyers being able to change it easier upon closing or if lighting is poor and the space needs to be brightened up.  

This is generally going to be a loan product for a long term buy and hold property. 

This whole argument of doing it one-self has stood on an assumption "it's EASY" and "Anyone can do it", which NO, that's not true, it's NOT easy and no not anyone can do it, anyone can try and most likely do it really poorly, with lots of screw-ups, and get into litigation which there ya go, that's 10X the cost an agent would have been. 

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

To avoid going through the same poor experience, keep reading.Even if someone gives you a referral here, do NOT make the mistake of assuming that the PMC will meet your expectations, just because they met the expectations of the referral source.In our experience, the #1 mistake owners make when selecting a Property Management Company (PMC) is ASSUMING instead of CONFIRMING.It's often a case of not doing enough research, as they don't know what they don't know!

We had one young lady, good job, good credit, good rental history but she had poor taste in men.

It will sell mores easily and be a safer product.

My initial infant level of knowledge would tell me it's a combination of being poorly managed (I calculated they're spending nearly 65% on expenses to only have $305K NOI on 95% occupancy at $875/m, if that's even the average rent/unit currently occupied). 

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

When I want to refinance, I just look for a lender and vet them and analyze their loan products.