There's something not fun about bow :
A low tier bows (everything under horn bow) don't make enought damage to hurt or even stun an armored target which is not fun at all, even with 5 Pd. But high tier bow with pure archer build do too much damage in my opinion, specialy when loomed.
So to make hybrid bow build or ha more effective and less boring, and in the other hand pure archer more balanced what about :
-PD now give +10% damage (instead of 14%)
-Evey bow get +4 damage (tatar 22 => 26) (rus 28 => 32)
It would nerf a little pure archer (anything with 6 or more pd) and nerf the value of loomed bow + arrow (which is too high) and buff a little ha/hybrid archers.