if you have bad dps bursting at the start try changing your openers. If you are really doing everything you can, then there is nothing you can do.

Tomahawk into Overpower, soon as the damage initiates, provoke into rotation. It sucks, but if thats what you are referencing, thats really all you can do.

My earlier comments are to tanks that cant hold after I give them 5 seconds and still nothing.