Assuming you're raiding as fire, your haste is a little high. Should get it down to 3059 for the first haste plateau (but don't be under that) and use the rest to rework to more crit/lower your hit a smidge. For most fire mages, using a pure crit gem will yield more overall dps than using a pure int (320 crit vs 160 int), so that is also something you could look into.
My Armory: battle'dot'net/wow/en/character/draenor/Dasbearbelly/advanced
^^Sorry, can't post links
I raid as frost for the most part, switching glyphs in and out as needed (Evocation in place of WE). I may reforge/gem to crit for fire for Elegon attempts however.