The waypoint is off. Didn't take me long to realize the middle number could NOT be 580. it's 50, 0, -160. At least, that's what I used and found him no problem.
Zaen can be found in 50, 580, -160 that's near Betrayal entry, when in front of it, take on your right to the south and go to the end of the tunnel, you'll find him there.