Don't use Tomahawk in dungeons. Stick to Overpower. Like if you see a group of 3 monsters, don't use Tomahawk on one of them and then use Overpower. Doing this means you won't have agro on the other monsters for over 2 seconds. That's enough time to send the monsters to one of the DPS, and then you'll have to chase after them to get them back.

So just walk up, open with Overpower and try to hit as many as you can. Tomahawk is only for bosses or single targets.

As for rotations, every single dungeon is different. So there is no point in trying to copy what other Warriors might do. It also depends on your healer. With some healers, you won't be able to do the things you did on that one dungeon. You just have to kinda go with the flow. If you want to stay in Defiance the whole time and only use Deliverance for bosses, that's fine. It won't make that much of a difference.