Good one, nice you try another build.
I'd rather go with 18/18 though. 1 less WM, 3 less Agility but 2 more ATH and 5 IF.
The 2 ATH isn't only for running as you're no kiting archer anyway with 1 stack of bodkins only but rather for nice melee fighting as movement is important there.
Level 30 (4 420 577 xp)
Strength: 18
Agility: 18
Hit points: 63
Skills to attributes: 2
Ironflesh: 5
Power Strike: 6
Shield: 0
Athletics: 6
Riding: 0
Horse Archery: 0
Power Draw: 6
Power Throw: 0
Weapon Master: 6
One Handed: 82
Two Handed: 1
Polearm: 1
Archery: 144
Crossbow: 1
Throwing: 1
That was my build during my last archer gen. pretty nice with a +3 1h.
But of course your build does a good job as well!