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Are you sure, because EF is a huge chunk of my damage on Mage, like 16%. The biggest driver of EF is time since last proc. You could swap weps to a pure sp chant but within a few seconds you already have a huge increased chance to proc again. And since dots don't snapshot anymore this really isn't worth doing IMO.99% sure this is an assumption that was made without proper testing. EF is worse if you keep good dot uptime and less reliable on burst. It has a capped PPM (Affected slightly by haste, not enough to make much difference though), as a boomkin if you multidot effectively then EF quickly runs out of procs and 16 flat spellpower overtakes.
Also wanna consider astral communion glyph. It helps you multidot quicker overall.
http://us.battle.net/wow/en/forum/topic/6893549789
Also your druid is now feral :-/