simulacrum

So..
Level 90, Chronomancer.. I am pretty Heavily geared running spark as well as Choir of the Jade Storm. I found this to be some of the best damage I can do. Seem to do okay on most content but Simulacrum is just another level. Max I can get to is wave 7 but the mobs just overwhelm whatever setup I try and throw at it. Anyone else have this problem in Simulacrum? The bosses are not to bad, it is just the overwhelming waves I can't stop. Even tried a freeze build and it was not enough. This is on level 0 too.. I can't imagine with the higher difficulties and all I know to do is not even try it anymore.

Thoughts on this anyone?