My mage is my worst geared toon in my heroic team, in my sig, and she does the most dps most of the time... Not sure why yours isnt pwning as much... I make sure to pop Icy Veins, along with all my other cooldowns every time they are up, and that alone is a huge dps boost. I really should get to putting my toons in my avatar with the nifty new feature, but i have those weird accents on the letters so its not that easy.

I used to run 2 locks and a mage for dps, but swapped out a lock for a shaman, and the totems and heroism add so much dps to my mage and lock, I dont know how id do without em. I'd get rid of the boomkin myself. Much easier to manage shaman dps than boomkin eclipse procs.