Club is a perfect example of how it should be done. +3 brings it from the peasant category to the same level with the flanged, knobbed and spiked maces. Doesn't make it OP, but perfectly balanced. I wouldn't mind if the pitch fork for example would get similar or even bigger bonuses. Even +10 stab damage wouldn't make it overpowered compared to the Awlpike. It's a oneslotter though so needs to have somewhat worse stats.
Boar spear already gets huge bonuses when loomed, making it one of the best polearm weapons and by far the best 1 slot polearm.