If that covers the $400 I think you’r ahead.

Some/many lenders don't like a 2nd mortgage behind their first (like the skin in the game), however there are both bridge or permanent financing options out there allowing you to leverage anywhere from 90% CLTV - 100% CLTV, but don't expect good terms...

I am using the BRRRR Calculator and was wondering if Homeowners Insurance estimate was included somewhere or if I had to manually enter it somewhere? 

A borrower really needs to have at least some "skin in the game" to make lenders feel comfortable.

@Kyle DeboerEveryone is going to want to see some skin in the game.

Several ways to skin that cat  ;)    With the DSCR lender, you could close directly in your LLC and it would not report to credit.

However, in the off chance that I am not able to cover my gap funds (est. $200-$300K) from that small circle, how would you recommend I start branching out?

GP's typically have to put skin on the game.

So I require skin in the game (average is 5% to 15%) to offset this.

It is nicer to use than a regular chlorine hot tub especially on your skin but I don't know if the maintenance is any better or worse, personally.