I think 8-16(17) is fine.
Do not forget the original 50 weapon in this server is 6-12.
Archer will be an absolutely beast with 50 weapon as a ranged class. I would expect AB will be like 800 + damage on a single target, easy reach 1000+ with extra fireshot.
No routed!!!! easy 1000+ damage in 1.5 sec.
With the newest updates for archer, Archers could leave or engaged in a battle field using "Shadowstep" (one click).
I am really looking forward to the new changes.
However, I would suggest GM test the damage of every weapon on a 52 level character using normal 50+ kit.
Simply increasing original 50 stats by 33% I get:
PhantomBow 13-55 Critical + 3
GoldTigerAxe 4 - 63
ButcheringBlades 15-47
FanOfCrane 4-12 Acc+1 Holy + 8
LotusStaff 8-16
Thoughts?