Merge the damage versus small and damage versus large stats of weapons, since they don’t really matter that much and add mostly pointless complexity. Damage should be more dependent on skill than on the size of the target monster. The only problem is how to stop the highest-damage weapons from becoming used by everyone because they’re so optimal; perhaps skill should do something drastic like add an extra die with every skill level, allowing you to have weapons that are decent at low skill (by having multiple small base dice) but poorer at high skill (because adding more small dice doesn’t work as well).