Here's what I do.

- Mark
- Tomahawk mob 1
- 2 x Flash if mobs are slept/ Flash + Overpower if they aren't
- Maim combo on mob 1
- Butcher's block combo on mob 1
- Additional Flash/ Overpower ( depending on slept mobs )

What I do next ( provided mobs aren't asleep ) is tab between mobs. I usually do my Skull Sunder on mob 1, and then I tab to mob 2 and 3 and I butcher's block the one that needs it. ( When the healer's aggro is rising ) Followed by more overpower and more tabbing.