The issue I had was that most lenders required a certain number of completed flips done under a LLC.

Why is this an issue?

There are two types of return from a rental propertyCash Flow & Appreciation.I normally also aim for a minimum of 8% return between Cash-Flow and Appreciation.Appreication, nationally, is around 2% to 3% annually.Therefore, your goal is to get the cash-flow to be about 5% to 6%.The issue is interest rates being very high, you would therefore, need to buy at a pricepoint where the numbers still make sense.You can always put down more of a downpayment to cash flow, but that will impact your cash on cash return calculations.Best of luck!

They refuse to get their payment processor on a call with me and amex to resolve the issue. 

But I am running into issues on the cash out refi side.

Be prepared to face fluctuations in the market, unexpected repairs, and tenant issues.

A national buyer would review the BPO and maybe do some brief online research, but would not typically not know, as in your example, about the sewage issues or extent of interior rehab needed.

There really isn't any magic to the Wally Wrap, but it does solve some issues and it has been vetted with thousands of transactions.

Then there were some issues with the inspection report that ruined 3 contracts prior to me getting involved.

I don't know how you uphold your fiduciary duties while wholesaling without running into ethics issues.