Unfortunately, that's Bows in general. They don't have good scaling and their effects are kind of lackluster with the exception of some of the more recent ones like the Fortune's Favour.
I wish I could offer ways to improve them, but for the most part they need a ground up rework on a per item basis to be brought up to spec with other weapons.
EDIT: I forgot to mention that the best bows at the moment are usually mutated weapons. Which speaks volumes when Mutation was slapped with a -5 hit nerf recently. It says something when an axe is a better bow than a bow.
Even mutated daggers are better bows than bows.
I wish I could offer ways to improve them, but for the most part they need a ground up rework on a per item basis to be brought up to spec with other weapons.
EDIT: I forgot to mention that the best bows at the moment are usually mutated weapons. Which speaks volumes when Mutation was slapped with a -5 hit nerf recently. It says something when an axe is a better bow than a bow.
Even mutated daggers are better bows than bows.