You are effectively operating a hotel, which is a business enterprise with very different risks and hazards to insure.  

Just be aware that (1) you can easily do whatever it is Tardus is selling much cheaper elsewhere (2) Tardus special investments for members only are mundane investments available at the same terms to anyone with a computer and internet connection and (3) the strategy of borrowing from a HELOC to juice returns carries with it a much greater risk than is apparently disclosed. 

The equity model has risk in that it is not going to go directly as planned.  

#3 Sell and invest elsewhere.Condos add risk. 

Section 8 would tend to carry higher repair and as a result, additional vacancy.OP’s definition of cash flow is rent minus piti.  

Maybe selling is the best option stop the bleeding and do something that is more risk adverse. 

Owner RE has work and risk.  

The risk with BRRRs and flips is they are riskier.

There is no stock account that gives the leverage real estate does, at as low interest rate real estate does, at as low risk/ volatility real estate does. 

It looks like a great idea on the surface but the numbers don't stack up from a risk/return point of view as far as I'm concerned (it could be different for you depending on your return expectations).