There is nothing wrong with your figures. Bows got shafted in the damage department in BG2, while crossbows remained more or less as effective as they were in BG1. Examine your Normal Heavy Crossbow, then examine your Normal Composite Longbow. The NHC is simply brutal when compared to the NCL, let alone the enchanted ones... ...
Then examine your bolts, and compare them to your arrows. It all adds up. Heavy Crossbows of Doom are appropriate for non-Archers as they need every shot to count. Archers though, will be better off with a Light Crossbow of Speed as the damage output will be dramatic. Think Tuigan Bow.
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