Thanks for the reply. I was looking at the lethality tree. It looks almost like what I want. But the 2 heavy hitting abilities, or at least what seem like the heavy hitting abilities, weakening blast, and cull, are only 10m range. Also, from my understanding of tactical advantage, I have to shiv to get it, which is a melee ability. Having a ranged class tied to a melee ability in order to use it's best skills seems like a poor design choice.
I haven't looked into pyrotech. I'll check that out. Taking a quick glance at the tree specific skills shows that they're both 30m and instant. So that looks more along the lines of what I'm looking for.
Anyone have any experience with madness sorcs? I'm curious how mobile they are as well.