Hmm, why not try a click macro with your mage olipcs? I know from my own experience that it does wonders, my mage at level 72 was specced frost with a simple frost rotation, I respecced it to arcane and went from 600-800 DPS to 1100-1300DPS at the same level, on the same mobs +target dummy, quite a boost. Same story for my warlock, went from 700-800 DPS to 1500+ with minimal tweeking.
I thought about respeccing my mage to arcane, but currently I stayed with frost for the following reason:

- I'm quite satisfied with his dps
- he applies the +5crit debuff with frostbolt, which doesn't need any management
- the macro he uses is extremly simple
- he gives my group replenishment

Although, when speaking about arcane:
Why do you need /click for it? -I thought a simple /castsequence reste=target Arcane Blast,Arcane Blast,Arcane Blast,Arcane Missle would do?