Dude, Where's My Luck?

[Slappityslap]

Ok boys and girls, I now declare myself as the unluckiest player of this game. Yes people, I'm talking about The Elusive Four. When I started this achievement hunt, I started out pretty good. I got Ripper and Argex in few runs but then, nicely said, the doodoo hit the fan. After about 300 runs to find Amra-zu I gave up and offered 100k for the kill. A guildie of mine found him in like 10 minutes and I had the kill. Now Skratch, my counter is ticking aprox 150 runs including about 30-40 runs with increased spawn rate in WT4 and nothing.

So dude, where's my luck?