But Maccavian Xbowman's Xbow is hits you very hard than other ranged weapons and it's penetrate a heavy armor very hard as well so i think it's already balance now. Why don't you talking about other factions like Hakkon the weakest faction in game that always get bullied by Drahara and Kaikoth?

You don't understand. Hired soldier are the one you can customize. You can give them the same crossbow and ammo than Maccavia. They are just straight better in base stats.

I don't say it's unfair or whatever, but the hired faction is, by definition, stronger than everyone else since they have no weaknesses (they have all the units possible). Which is balanced by not being the best anywhere (IE other factions have better in their specific role). Except for crossbow, where they are the best.

Maccavian both in lore and in the game is the crossbow faction. They have a unique crossbow, unique ammos, and the highest crossbow proficiency of all the "regular" faction. Except for the hired soldier, which have more stats.

I can't talk about the other faction, but Hakkon seems rather strong. They have taken over the dwarf in my game, and assimilated many lords. They are rather scary right now.

I think hired soldiers are a higher level

They are indeed. But that's my point. The generic crossbowman are better (in level and stats) than the specialized faction.

Hired mercs are your end game troops anyway, also their higher lvl make them more expensive, but end game, money isn't an issue anyway