I ask, because there is a delicate dance with reaching the point where as the attacker I'd ask "Why would I ever want to activate a critical hit? It just dumps my damage into an infinite buffer..."
Are you forgetting the stun
? Being reduced to 0 wounds under this system inflicts a stun
for 1 round. Is that not good enough?
You have a point. The problem is I want this to to be both simple and meaningful. Meaningful means there's an actual choice between choosing to do Wound and Vitality damage and they aren't just alternates of each other. Simple means I have to change very little of the existing system so I don't want any complicated sub-systems based on number of Wounds left.
I'm not really concerned with low Wounds effectively being an infinite damage buffer: anyone who doesn't want to one-shot a bad guy but also
doesn't want their damage wasted is too finicky for me to help. That sort of person should use your rules instead.
The best I can think is that people shouldn't be forced to decide if they're going to activate the crit until they know the damage roll. Low damage roll going to Wounds at that point won't waste much.