Today we continued with our GURPS Conan game, and we had this problem. The characters were fighting ghouls, and one of the characters, the Nemedian knight, stroke the ghoul with 20 hp to the head. The ghoul was at -17, so he had to roll his HT (12) to check whether he dies, passes out, or whatever. Well, he passed all his rolls, which is not very difficult with his HT 12. This bugged us and broke our suspension of disbelief, such hit should have felled anybody but very powerful monsters (and this was not the case).
So, we thought we should apply some penalty to HT rolls (the -1 per full multiple of HP is not enough). I thought of -1 for every -1 HP, -1 for every -5 HP, or something in between.
What do you think?