I think yeh might be running into a gear problem. If I remember correctly there wasnt much gear to be had for elemental shamans and balance druids yeh end up having to gear with lots of cloth.

For instance what yeh can do is drop a Earthbind Totem as close to the critters as possible and drop Stoneclaw Totem in between you and the critters then move to max distance of yer ranged spells.
Remmeber to hit em with frost shock to slow em down more.

At 64 yeh get Wrath of Air Totem which would help out yer group a ton.

Yeah it would be easier to switch the druid to a feral tank untill yeh get more ideal gear for yer casters.