Is the accuracy with 150+ wpf high enough?
You mean:
Is the accuracy with at least 150 wpf same as 180+?
And i can answer: yes. However, every point in wpf make your reload time shorter.
Why not think about stronger xbow?
Because i wouldnt be able to get 190 wpf, of course.
And with current dmg of xbows, even Siege (sniper) one isnt 1shotting, most of people just have another 5-15 hp left :/
Of course, you WOULD one shot agi monsta and archers, but... if agi monsta get close to you, you are dead, due to low wpf in other weapons and no athletics etc., and if you spot archer in short-medium distance, you have only 1 shot, then you must reload, and he can try to avoid first shot and counter it in 2,5-5 sec (depends on archer).
So i would take my loomed light xbow. And I think version A is the best, 9 str, not too bad armor, even nice weapon, 10 athletics, 10 weapon master, agi monsta, 3 ps... great
PS
Level 30 (4 420 577 xp)
Strength: 12
Agility: 30
Hit points: 47
Converted: 14
Ironflesh: 0
Power Strike: 0
Shield: 0
Athletics: 7
Riding: 0
Horse Archery: 0
Power Draw: 0
Power Throw: 0
Weapon Master: 10
One Handed: 1
Two Handed: 1
Polearm: 1
Archery: 1
Crossbow: 190
Throwing: 1
with heavy xbow... wouldnt be as fast as once heirloomed light xbow, and well, the point of getting my build is:
a) shot speed rate almost same as archer with longbow, or even a bit faster
b) 30 agi and 10 athletics with above = archers nightmare, can avoid arrows!
c) no one but extreme ninja and horses can get you!