Bow damage itself isn't reduced. It's the damage model that has changed. The result is that bow's in this mod do almost no damage.
armor_soak_factor_against_cut = 0.55
armor_soak_factor_against_pierce = 0.45
armor_soak_factor_against_blunt = 0.35
armor_reduction_factor_against_cut = 2.75
armor_reduction_factor_against_pierce = 2.05
armor_reduction_factor_against_blunt = 2.25
Above are the New Dawn damage values. Below are the native damage values. If you want bows to do more damage, I would recommend that you lower the reduction factor of pierce, cut, and blunt damage.
Be warned: The AI will also do more damage to you. For example, if you lower the values to the native ones below, Vaegir archers will suddenly become huge threats.
armor_soak_factor_against_cut = 0.8
armor_soak_factor_against_pierce = 0.65
armor_soak_factor_against_blunt = 0.5
armor_reduction_factor_against_cut = 1.0
armor_reduction_factor_against_pierce = 0.5
armor_reduction_factor_against_blunt = 0.75
In order to change these values, go to modules / A New Dawn / and open module.cfg with the note pad. After that scroll down to where you see these values and change them to your liking.
This post is basically a copy-pasta of a post by Light_gemini in the thread below so please give credit to her.
http://forums.taleworlds.com/index.php/topic,322862.0.html