Cool, thanks guys. You gave me a reason why is the problem occuring and how to prevent it or deal with it. I owe you.
Allow me one more question... I guess the enrage timer is too tight for us to actually slow down instead and squeeze 2 DD's into one DS phase?
Yeah. There's a significant chance you'll hit enrage anyway unless you can speed up your DPS.
One more thing actually, do you have marauders in your group? If so, make sure all your DPS are in the same group (so either left or right side of the frame) so all your DPS get the bloodthirsts.