At 30 your mages get next rank of arcane explosion. I ran sm gy until 31 .. the mages can contribute some before 30 though. it is notably better at 30+. I have almost same team.. paly tank though with 60 mage boosting the paly>priest>lock and mage. I also practiced pulling with the eye but eye pulling seems to work best when the mobs path back through mobs...and gy is too open for that.

With that said, im not sure its faster/better boosting with a 60 mage than having a team all same level doing the dungon the normal way. Ill let you know soon, as i am leveling my other mage to catch up. She is 23 atm. My team is 33.