In the combat logic area of your combat routine file, add: Code: Cast("Blood Rage" ret => !LokiPoe.Me.HasAura("blood_rage"), I'm not a pro at this so just test it out somewhere where you won't die like the Ledge.
I'm just using a cast when dmg taken with immortal call/blood rage along with an increased duration gem. Seems to keep it up almost indefinitely without messing with the bot or having to cast at all.