Crossbows have always sucked for me too, so I don't use them anymore. I mostly used the regular bow for my long-range weapon until I got my party to learn telekinesis.
Had to look up some info, because I honestly don't know that much about them, but I did find this rather interesting: Crossbows have an even greater chance of missing the target when the weather is bad (stuff like rain, snow, dust, etc.) or if your character's vision is impaired.
Other than that, I would say that the reason the crossbow misses is just part of the game mechanics. Gotta even out the weapons pros and cons, and a high rate of missing the target is one of the crossbow's cons. If you really want to keep the crossbow equipped on your character, then I suggest finding an accessory that improves accuracy. The only one that I know of is the Cameo belt, and it's bought in Balfonheim and I'm not sure if you've made it that far or not.
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