Originally Posted by Mintrol

You don't seem to have 2nd peace of T5, that makes a huge difference in your dps. 20% more damage to AB's.
A Must if AB spam is your main dps.

Your present gear is more suited for Fire mage, you have 166 hit rating (fire needs 164), arcane 76 (127 for frost bolts).
Your legs, bracers and belt have hit gems? Why? also the +15 stam gem is a bit waste.
Change legs hit to +12 dmg and regem belt either with +10 int a& +10 spirit (more mana regen)or +12 dmg's , wrist regem with +12 dmg.
And those if you want to stay Arcane, but changing to fire not much change needed.

And the other mage in your guild has Fire gear and arcane spec.

From your WWS. You seem to use Frostbolts for main nuke.
I'd recommend you to spec fire if you do not have 2nd T5 to equip. Once you do spec back to arcane and spam AB's.
And for arcane replace hit gems with +dmg , +spirit, +int.

And try to get the SP to your group, talk with the raid leader about it. Priests do not need SP, they can use potions.
But your guilds raid caster dps is limited because of mana issues.

General note: get RAWR and input your gear , fight stats and see what will improve your dps.