That's exactly how I play, though I'm only level 28-29: Kill the adds, let companion die, cloak, res the companion, take the end boss (or not; sometimes I die once if I get it wrong).
I'm doing the bonus series for the planets I'm on and have picked up three or so datacrons. I'm keeping my gear up and my companion when I get drops for him. I'm finding Khem Val to be lackluster compared to Revel, mainly because Revel doesn't have to move to switch targets and he seems to do higher damage than Khem. Too bad as I like the big psycho.
I'm deception, almost all points so far. Not asking for a fix, just reporting what I see.