All classes get damage bonus from wpf.
Ranged have this PT/PD wpf malus, to actually lower their accuracy and speed, if they decide to go for high PD.
Everything is balanced around it. Weapon has more base damage to make up for this 5% dmg loss. Also, range profit a lot from speed bonus, so it kind of compensates.
Honestly, it seems decent atm, i wouldn't even mind an higher malus for higher PT/PD.
11*PT for every PT under 6
12*PT for every PT 6 to above, or such.
To really make a difference. At this moment, just aim for 6-7 PD/PT, and then level up and Max WM to make up for it.