Most investor utilize short term hard money debt to scale their flipping operations where the lender will fund 80+% of the purchase price and the rehab budget which can allow investors to work on multiple projects at once.

I would use money from a HELOC that I have open to fund the down payment, but as @Scott Trench stated recently on the podcast, that is a short term solution, and I don't want to hold that $48k debt for more than a few months. 

So I did that and my property revenue cannot service the debt but using my strategy I'm cash flowing $1100/month after PITI on a new construction home under warranty. 

The only way you can break that log jam right now is severely lowered fed rates, but the level of federal debt is such that they're in a no-win situation because there's going to be little appetite these days for buying 1% fed notes from overseas.The fed rates were kept too low for too long.

When an IRA borrows funds it can lead to a tax called UDFI (Unrelated Debt Financed Income Tax).

also noting most people arent' aware but the credit score run by a mortgage lender and say a general lender like a bank are actually going to be different scores (and likely slightly different ranges) - with some greater weights on mortgage debt for the mortgage lender Credit Bureau settings

Leverage in an IRA will produce Unrelated Debt Financed Income (UDFI), subject to Unrelated Business Income Tax (UBIT).There are plenty of investment options to deploy your IRA funds, but again, using your IRA in connection with this transaction will disqualify your IRA. 

An LLC creates a legal separation between you and the property, so if something goes wrong—like a lawsuit or debts related to the property—your personal savings, home, and other assets are shielded.

The tax debt was about $7k on the property. 

Is the 5 property ceiling (estimate, of course) because of debt to income ratio?