The problem was that the game used final damage, including crit multipliers, to determine overkill for gibbing. I adjusted it to directly use the unadjusted weapon damage for this, so the issue should be cleared up. Now in order to get a zombie to completely disentegrate, you have to use an exceptionally powerful weapon, like a shotgun or an assault or sniper rifle. It’s easier to do with very small targets, so there’s still a use for the small game arrow, particularly with small game, like squirrels and rabbits.
As always, high-speed impacts with vehicles gib like crazy.
Explosions probably don’t gib as much as we’d like, have to double-check that.
Some of the melee weapons actually put out a lot of damage, and may still pass the threshold, for example the sledgehammer. Need to take a look at this too.