make sure you're getting behind your targets and don't stand still for too long when you are behind them, they have a higher chance of spotting you if you're in front of them. even when you get behind them if you stand there for too long they'll still spot you. currently lvl 29 and i'm now reaching taris (suggested starting lvl 32) because i have a bad habit of stealthing past hordes of mobs to get to the quest objective and move on. with stealth, blackout (or w/e its called), vanish, and mind trap, I rarely have to fight anything unless I choose to.

It does show up on your map, just not anywhere you'd expect it to. It's on the northern side of the valley where you did the quest leading up to it.