Chardok pipe

[EQBallzz]

So I went to Chardok last night to try and acquire the last piece for my Robe of the Whistling Fists. We set up group in the cave under the bridge with the slaves and I pulled mobs up the tunnel towards exit and the other way towards bridge. Never saw an Iksar Betrayer spawn so I'm just wondering if anyone has any tips for this camp to improve my odds next time.

It seems there are like 3-4 roamer spawn points right outside the slave cave so it seemed like a good spot but maybe there is a better one or maybe I need to focus my pulling from a particular area over another?