This is not in line with the numbers Dalai posted. If that's the case, they should definitely be tweaked. Dalai has said that the bow does from 1-30 points, based on how fast the arrow is travelling when it hits the target. One presumes that a full draw is needed for full speed. It's also possible that the speed drops off over distance, so it may be impossible to get that 30 points at a longer range, something that apparently isn't a factor with the crossbow.
Some questions on the bow figures:
- Did you make sure the bow was fully drawn?
- Did you ensure you weren't hitting the head's collision cylinder?
It also seems that guards don't get the benefit of additional damage when attacking from behind. I think they should.