Honestly, I find the Inverted Boomerangs to be glass smooth and a lot of fun. You shouldn't have any problems there. As for Kong, it's definitely one of the smoother SLCs. So that should also be good.
Agreed. My first ride on Two Face was fantastic. Going through the vertical loop backwards was intense.
As for the SLCs, the only one I've been on is the Mind Eraser at SFA. Rough ride but I can tolerate it. Usually it's rough after the sidewinder, and that's where I brace myself.