Hehehe Howl my brothers! Yet another one having difficulties with you!
HOOOOOOOOWL! Hehe, kidding there mate!
You are not the first, they have a regeneration that maxs them real quick and you need at least a +2 or 3 weapon to really hurt them, spells that either lower their resistance, saving throwws are good, massive damage in as short time as possible is to be prefered. Take out the wolfwere´s with alot of spells at distance and shoot alot of arrows, and concentrate the fire to pick one at a time and grind them down.
If you have found the sword +2 +4 vs shapeshifter and has someone in your party that can wield it, use it!
Good luck!
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Yawning lazywolf dreaming about nice little fairies...zzzzz