Quote Originally Posted by 'knopstr',index.php?page=Thread&postID=184869#post 184869
My DK is lvl71 and my shamans are 80
I think this will be the biggest part of the problem. I suspect your DPS will be significantly outthreating your DK tank, even if you were playing it absolutely perfectly.
Get the omen threatmeter (or other) on all your toons and watch the threat your shaman are doing. This should confirm this.

I would suggest searching the forum for a dps rotation macro for the shaman.
There is a long thread by Fursphere with lots of great information.
Most importantly bind this to a key separate from any that your tank is putting out.
You can concentrate on tanking more fully and have your shamans dpsing by spamming 1 key (or can stop DPS if it looks like they are in danger of outthreating your tank).

Other than that make sure you are in frost presence on the DK. (I know I'm starting the obvious).
If you can get a full set of the cobalt gear (i think it is) for your DK (My dk is only 73 and I tanked with a couple of higher levels with that gear and did fine).

Take your DK out and have your shamans out of group and quest boost him a couple of levels (I'm sure that will make a huge difference too.