Ugh, clubs need fixing. I Get better results from unarmed orcs than I do with silver clubs. Yes, it's heavy, but unlike almost every other bludgeoning weapon ever it dosen;t take five shot to an unhelmeted guy to do enough brain damage to kill him. Only the "Bludgeons" attack seems to do even a slightly remarkable amount of damage, while the orcs refuse to do anything but pommel strikes and jabs. What is the contact area you have set for them?
EDIT: Found the issue. His hands were full so he did nothing. Doing more testing in the arena. brb.
EDIT Again: They have an unfortunate predisposition to jab, which does jack all, when they enemy is hacking away at them with swords. Even full on "Beats" or "Bludgeons" Rarely do more than tissue damage. I looked at the raws, and if the contact area really is 8000, than these weapons are so useless I should put them in a danger room. The Contact area on a vanilla hammerbash is ten. For a multigrasp weapon made of silver, I would expect more than a few bruises. A dwarf wielding a copper warhammer. not even a multigrasp weapon, without a shield, wins every. single. time. Against and Uruk-Hai with a silver club. It takes a leggendary hammerorc with a slade club to match the performance of a dwarven conscript armed with a copper war hammer.
EDIT yet again: Almost all the modded blunt weapons share this issue. The contact area is WAAAAAAY too big. A collosal slade mace is inferior to a regular copper mace, or even a sword in terms of bludgeoning power. this however, explains why they only use handle strikes and jabs- They have the lowest contact area and are far more effective than using the weapon as intended.