Being a Wizard in Inferno: wut do

My wizard is currently at the very beginning of act 3. Act 1 was a breeze for me, and in general act 2 wasn't bad either. I find that trash mobs are easy, as are some champ packs.

This is my problem: unkiteable champ packs.

I have tried a variety of builds, ranging from the balls deep arcane orb build, to blizz/hydra. I've tried adding magic weapon, adding more defensive skills, you name it. I feel as if it is irrelevant. There comes a point against certain affixes where I run out of tricks and the pack is on top of me.

I have considered stacking resistances, but to what end? Force armor gives me a 3-4 hit leeway. My issue is not mortars and ranged attacks. It's shit being in my face. Even if I DID invest tons of money to break the efficiency threshold of force armor with resist all, I would not have the sustain to tank these mobs.

I feel as if I'm stuck in this spot where I need to either be able to take a TON of hits, or I need to kill champs much faster.

I'm currently sitting at about 30k dps with magic weapon (post nerf, grrr). Is my DPS the problem? 30k is obviously not incredible, but is it really that bad?