Don't skip Weaken. It's a huge -tohit, -dmg, -special. I would add at least 3 slots, although 6 slotting with Cloud Senses gets you good bonuses.
Add slots to Envenom. It takes a bunch of procs, or 6 slot with Shield Breaker.
You've got too many slots devoted to Stealth and Weave. Move slots from there to Weaken and Envenom.
Stone Cages doesn't need more than 2-3 slots. I would move SWotC to Stalagmites. You'll give up some proc damage but add a lot of control.
Switch the Decimation proc in Arcane Bolt to the Dmg/Rech. The proc is 1 PPM and almost never goes off.
Slot Volcanic Gasses for hold, not damage. Best AoE hold in the game.
Drop Infiltration and switch Spirit Ward for Mystic Flight (this will give you the power pick for Weaken).
Drop Vigor for Musculature or Intuition Radial.