i dont use flash on my WAR either in honesty. i used to but it's easier and better threat just to move 2 steps and overpower!

Mark>Tomahawk>Overpower>Brutal Swing(Such a long cd leave the stunning to a dd)> position around back of stunned mob> Overpower again> Holmgang the mob facing away still from stun> Maim combo > overpower > butchers block.

But really you can open with just tomahawk & 1 or 2 overpowers. As long as you are overpowering in between combos (every combo rotation if dps is high) it's more than enough.