Grievous wounds should require more actual skill to use.
Before you throw me a downvote for suggesting that Grievous wounds are OP, I'm just saying that the reason items like Mortal Reminder and Morellonomicon have to rely on either restricted application or making an item overall more inefficient is that you basically don't have to do anything to trigger it and in the case of Executioner's calling, you effectively trigger it at all times. What I'm suggesting is making Grievous Wounds apply via actives, but buffing its effect to compensate. As for the actual mechanics I haven't really thought about that, but I'm hopeful some of you would have ideas about how to go about that.