In my experience, your starting rotation and the instructions you give your dps will always tell how a raid boss pull is going to go. Like some of the previous advice, on a single target use your heaviest threat attacks. (i.e. shield slam, revenge, heroic strike, heroic throw, devastate)
If you use all of these regularly, your rotation should fall into place.
Make sure you use shield slam before your revenge, which has a change of proc [Sword and Board] which lets you use another shield slam. Get a addon that helps keep track of your CDs as well.
These should help a lot.
P.S. Pally and bear tanks don't hold a candle to single target threat that warrior tanks have.
