I was also thinking of doing a rotation like this.

Shaman 1 /cs ES, LB, LB, LB
Shaman 2 /cs LB, ES, LB, LB
Shaman 3 /cs LB, LB, ES, LB
Shaman 4 /cs LB, LB, LB, ES

That would just rotate in Earthshocks on each target about every two seconds making it almost impossible for a mob to cast. EJ is basically saying the best DPS for Shamans is CL then LBx3 then Rinse and Repeat.

Any thoughts?