Alright, so after 2 hours of farming for these rare Grophets, I finally got all three discs. Got the neural buff, got the scent buff. Got to the rock and could see the auras of the datacrons. clicked the big dumb rock and the tentacles popped out, but the datacrons were still not visible. Remembered reading about a glitch for cheating on these if someone else had gotten them recently. Sat down on the rock in the middle of the datacrons and waited for the timer on the anchored rock to reset. Fell through the rock and the datacrons became visible and clickable. Just zoom in, click and done.