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 know there's a way to leverage this into some healthy growth. 

GP's typically have to put skin on 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.

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.

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

We don't have kids (might in the future), my husband and I are young and healthy, have stable high-income full-time jobs, and just put in a lot of work to both properties so don't expect huge expenses in the near future.

The amount of downpayment requirement insures buyers having "skin in the game". 

The further you get into the deal the more skin in the game you end up having so it just makes sure you see the project through so you recoup the time and cash invested. 

With the numbers you provided above, you will have to ensure you have healthy reserves.