You're getting close to my Pally/4xShaman team in level, so here's my Shaman spec for comparison..
http://www.wowarmory.com/character-t...&n=Zandantilis
I usually save Elemental Mastery for the cases when I may be getting low on mana and need to end the fight soon, and I'll probably end up redistributing points a little when I hit 70.. like removing 2 points from Improved Fire Nova Totem and 1 from Call of Flame to put them in Unrelenting Storm.