Since DH1, I hated the fact that random hits of 1 wounds could go from a scratch to being stunned to become Prof. Xavier without legs, arms and psychic powers (except if you're a psyker).
I created this system in DH1. In DH2, the new righteous Fury system became even better for my own way of playing the critical damages. I hope it can be of use to someone. It's been 4 or 5 years that I use this.
You can find it here on the obsidian portal of my ongoing camping (the texts are in french, but the rules are in english).
https://obscurae.obsidianportal.com/wikis/critical-damage-system