You're over hitcap (which would be 289). Your gemming also seems off in some places - you have a healer meta and some mana efficiency gems where you should gem for throughput, I assume this is because you use the same gear for healing. It will affect your performance somewhat.
Also, your rotation is off. Your opener should be something like this:
Apply VT and DP (which you do first doesn't really matter. They have the same priority.
Use a full MF to get 5 stacks of Shadow Weaving.
Apply SW:P.
Then refresh VT and DP every time they fall off without clipping, after you've done that use MB when available and fill the gaps with MF. Don't forget to use your trinkets.
And replace that Int trinket. Get the one from ToC normal, it's better.
Also, what Aethien said, logs would be helpful.
Edit: I'd strongly recommend getting T10 tier pieces. Get four of them, in fact. Run VoA for the two you can get there. Once you have the four piece bonus, remove Mind Blast from your rotation.
Edited, Jun 27th 2010 11:26am by Kalivha