Ok so can't use Blood weapon in Grit since it gives bk mp which is important for DRK understandable.
But that means DRK rarely have a use for it while tanking.
My suggestion make Blood weapon have 2 separate effects that activate depending on weather your in grit or not.
Keep it the way it is when not in grit so it gives bk mp.
But if your in grit have it instead give bk hp.
I know some people going to go on saying NO that's too OP. So then adjust it by increasing the cd time on it and only have it give back 1/4 of what you hit for back as hp.