[Globu]

Having thought about it, here's a really quick suggestion for stats I'd offer for the bows.

First, note that effective range is heavily affected by precision. Thus, if you gave them a weapon with the same stats as a longbow but with a precision bonus of 2, it would in fact increase effective range, so it's not necessary to improve them too much in other stats.

That said, here's my suggestion:

Range 40. Damage 14. Precision bonus 2, but this has to be balanced by your cavalry units' precision -- if you're giving them precision on the order of a base 12, that's already a heavy advantage. I'd suggest 11 precision on the cavalry and precision bonus 2, which amounts to a horrific base precision of 13 on those monsters.

If you'd like to up the range a bit, I don't see why a non-round number won't work. 42? It's the answer to life, the universe and everything, anyway.

I'd definitely shy away from AP, as that's clearly, in the game, the province of the fire-every-other-round crossbow mechanic.

The lack of applicability of fire arrows still is kinda bothersome though. Anyway, that's my suggestion for stats!