If you don't qualify for enough to buy a turn-key property, look for a fixer and put in some sweat equity.You've already gained some house hacking experience from the first property--why not tap into that experience and house hack again?

Am I correct that my LLC could partner with my SDIRA if it were a purely passive investment, like a turnkey property managed by pm that I put no sweat equity in?

It isn't as hard as the naysayers say, and the sweat makes you appreciate the results.

So, don't sweat the "no cashflow" thing.

We put a lot of blood, sweat, and tears into it! 

Sweat out improvements to curb appeal and make friends with the neighbors.

Sweat equity.

.: Don't sweat it.

You can't get paid for your "sweat equity." 

You will either need to get enough sweat equity to have 20% - 25% at the time of refinance, otherwise you'll have to bring enough money to the table to buy the equity.If you are doing standard mortgages in your name, reserve requirements can be calculated following the guidelines here:Calculation of Reserves for Multiple Financed PropertiesIf the borrower owns other financed properties (determined in accordance with B2-2-03, Multiple Financed Properties for the Same Borrower), additional reserves must be calculated and documented for financed properties other than the subject property and the borrower