Or investing in some small scale REIT.

Single family houses long term you can't really scale them that much.

It is one of the  larges investors groups in the nation, well worth checking out.  

You have to have a fairly large scale to justify it.

Would a large down payment have been better?

The credit card debts were predominantly "0%" but that costs 3% every 12 months to transfer as we pay down and is a big thorn in my credit score to have large balances on credit, even when under 30% of available. 

Can anyone suggest an alternative that can scale from tracking all aspects of a single rehab to X many at a time?

Are you looking for someone to do full-scale remodels/flips, or more just someone on call to do any necessary maintenance and repairs that come up?

Much more tax and compliance work, but benefits with scale.

Its ok (sort of) if you're looking at large trends in markets but thats about it.