Without knowing more about your actual play style, it's hard to pin down how best to help you, besides what others have already suggested. I have a 50 SR/DM tanker, and can tell you that smart management of toggles and having some end redux in powers, (both attacks and toggles), and without the Cardiac Incarnate, it absolutely isn't a problem. My educated guess on the matter, though, is even with the built-in end redux from savage melee, if your build does include hasten, and you are attacking as fast as possible without care for excess/overflow damage, you will bottom-out rather quickly. Efficient use of your powers, as well as knowing when *not* to exhaust yourself by consuming the 5 stacks of blood frenzy, is key...