The idea for pulping ability scaling with cutting damage is that with high-cutting weapons (e.g. katana) you’re using the cutting to deal damage efficiently, i.e. by slicing large muscle groups, cutting through joints, and cutting up organs.
We could adjust the pulping message based on the ratio of bash to pulp, e.g. “You thoroughly smash the %s corpse.” vs “You thoroughly slice up the %s corpse.”.
I agree that axes should intuitively be better at it than katanas, but I think that would be more an area for a “pulps well” flag than adjusting the pulping formula. Not that the pulping formula is perfect, I just don’t think it needs to be completely overhauled. Alternately there might be some commonality among the high pulping weapons that we could tease out, high peak damage perhaps?