Yeah so i would say make the archers quite strong
.
Cause as it is any decent infantry like principes owns archers in combat without enchantments .
2 principes cost 30 gold , so do 3 archers .
The principes own them .
If you do 40 principes vs. 60 archers then you use decoys to your advantage and they own them even more
.
Balancing them is quite difficult though because otoh the longbow of accuracy is cool . It hits almost always .
Imho giving all archers +2 precision and +3 damage would be a good first try .
I think you suggested this already also yourself in the other thread :
Giving x-bows a rather short range like 20 but an extremely good precision would be worth a test also .
So new x-bows fire every 3 turns , have 20 range but 14 ap damage and at least 25 precision .
They were the ancient sniper rifles imho
.