When using more than 2 it adds a lot to my processes and have found the difference between these companies is very slim and is based on who you get from those companies, so I have stuck with these two (for now)

Rising interest rates, slim margins, and unexpected costs can kill a deal fast.

So all in all, the investment seems solid to me, and this is not my first rodeo, as they say.As for the risks associated with the SBLOC, I minimize those by only utilizing a portion of the LOC so that even if the market drops another, lets say 30%, the risk of margin call is slim.

I had purposefully waited as long as I could in case it was blocked, but I figured chances were slim at this point. 

The chance of winning is slim to nil.

Rising interest rates, slim margins, and unexpected costs can kill a deal fast.

Technically yes, but your odds of success are very slim and your potential will be very limited.

Your current numbers make no sense (600K property at 70% is 180K down and 420K financed, but four 300K properties at 95% is 60K down and 1.14M financed).The odds of finding someone to loan 95% on four investment properties is extremely slim.

Debt financing will be slim pickings

Which means, if you’ve structured your taxes as losses for the last two years odds of qualifying are slim.