I think without fully maxed on armor + weapon + professions, it is really hard to tell what works or not. It seems like NOT long ago when I was struggling to bring down 1 restore druid in a 5 vs 1 battle, where he heals himself until OOM. And 50,000 gold after, he went down in 2 seconds.

The reason I throw out the enhance idea is that it does seem to address some of the issues DK + 4 rets have , sacrificing some survial along the way. I am a huge fan of enhancement shaman's

Earthbind AOE snare + remove snare on group
Bloodlust
Purge
and the Wolf Pack is very intimidating. Suits this group's overall tone very well.