Quote from CataleptCB is impossible to balance, precisely because it gets more powerful at higher difficulty levels, unlike every other stat ever.
I can see why they want another DPS stat, but CB is, IMO, a total bust. It's neither interesting nor optional. I'll lobby for changing it to be based on the player's HP until the end of time, but basing it on monster HP is a design dead-end.
How about a difficulty system that does not rely on multiplying healthpools by 2 digit factors? Isn't THAT the problem of crushing blow? It CAN be allowed to be better vs high hp targets as long as it's worse agains low hp targets.