I wrote out a great long thread about how since you chose the Rusbow, dmg shouldnt be your conern anyway, you chose to pewpew a lot. But then I deleted it and decided to be helpful:
DONT get more powerdraw than your bow needs: holding your shots longer wont make you any better, it will just make your ROF drop.
DONT go past 18 STR, you need those other points for running the f*** away when Spammitar Huscarl SHielders rush you in a mob.
DONT use any bow untill you have 18STR, it will just give you a false expectation of accuracy
DONT buy or heirloom RusBow, it doesnt kill.
DONT worry about your arrow dmg, take w/e has the right amount of ammo for you.
DONT listen when they call you my old friendcher, they are just jelous that they have limited themselves to hitting ppl with sticks, like cavemen.
DONT expect to hit anything at range untill you have 150+ wpf: Longshots are to be attempted and give a nice surprise when they kill
DONT run untill enemy is literally too close for another shot
DO kite your targets into your mates.
DO remember that archer is a SUPPORT class. I close 1v1 in melee, either myself or opponent WILL die. With archery you do dmg without being under attack yourself, so dont be greedy: Shoot carefully, and dont worry about kills, your team will kill much easier once entire enemy team has taken a bodkin to the chest. The "Heroes" will think they are great, but us archers know the truth: Outperform enemy archers and your team will have MUCH MUCH more HP than enemy team when the fight kicks off.
DO remember that as soon as every greedy nub with a shield sees that they can get to you without having to fight melee troops, THEY WILL GO FOR YOU.
Game is about fun, not perfect build, if you like perfect build game they got one, its called WoW, all you do is perfect build on that.