But if there is cash flow, might be better to hold it.

I've definitely made some money both on the cash flow and appreciation (appreciation was a surprise in most cases).But that being said, the exit strategy is difficult and I can see why people lose money on these ventures.Four pitfalls I see:#1 Lack of control:  Depending on property managers who in most cases do not have your interest in mind.  

You get potential cash flow, tax shelter and appreciation.

Does all the cashflow return  back into the IRA and will I have to pay taxes on the cash flow taxable within the year it is generated or not until i take it out? 

More money is apparently flowing into the SFR rental space thus most likely driving prices higher.

You should be buying it because you can find a a right priced property that will cash flow with the properly vetted tenants in there.

In that regard I have available to me more knowledge about modeling cash flow and benefits of entity structure regarding liability and taxes than the average person.

Don't let the money languish earning nothing when you can pull it all out at a cost of next to nothing.Better yet sell the property and find cash flow positive properties to invest in.

Then you should cash flow very well! 

I calculated the same cash flow after refi so I think you're numbers are accurate.