Originally Posted by
Zoldor
Have him drop DnD under the warrior while he's AoE tanking at all times its not a lot but its some threat building while not tanking. Don't use defensive CDs that cause you not to get hit before pulling the AE pack to help build vengeance when switching from a Boss to their adds. You can also do some talent switching that can help. Chillblains can be helpful to keep the adds that are running off closer to you. Gorefiend for when they try and get away. Also a few seconds prior to switch if its necessary have him call out for a slow down by the warrior. Also, you can just spam out BB and mash a CD, DKs have a ton, and not have to worry about a death strike if threat is really what you need. If dying isn't an issue switch in the DPS cleave trinket.
We had a problem when I was tanking in ToT it was a DK Warrior combo and our warrior's AE threat sometimes out of the gate could be tough to get passed. (warriors have been great tank wise this expansion) I would have to call out sometimes if my Rues/RP wasn't built up enough or something wasn't off CD and he would just slow up for a second.
Make sure your warrior isn't thunderclapping right before a switch etc. Its the little things that can help. And his DPS isn't causing wins I'm sure of that much. If its on the initial pull your tanks shouldn't be battling for threat on the same adds. In that case whoever gets all the adds to hit em first is always going to have the threat.