One of the things I would change is skip on stoicism and get improved devotion which increase yer heals received by 6% the extra armor is always nice

At this point if yer doing something along the lines of a 9696 rotation there is no way any of yer chars will pull agro therefore its better to use
devotion aura/blessing of sanctuary.

While leveling the gear yeh get for yer dps shammies dosen't have to be mail yeh can use cloth or leather, as long as it has spell damage and int on it.
Just look at the stats.

I would also put chain heal and healing wave on separate buttons