Any chances to change Death Frenzy to be what it is on PnP? Ie: A huge, massive, and tremendous bonus to melee attacks, and you never die OR go unconscious while the frenzy is active. Once the frenzy ends, if you are below 1 HP, you go unconscious or die. (If too powerful for DF, maybe the capstone)

This could be paired with a stacking Vicious effect that grows with melee power bonus. Let's say, 1d3 to self, 2d6 to enemy per stack. Both scales with 100% MP. Death Frenzy (or Storm's Eye) lasts for one minute and you also get 10 melee power per stack. You get a new stack every six seconds automatically.