we had to place a restriction on Bastarnae Falxmen because they were so good
Bastarnae falxmen arent OP, they have 0 armour and die to arrow fire. This is what balance is. Rock paper scissors. Falxmen beat armour but die to arrows clear advantage and disadvantage, but the problem we have is those advantages and disadvantages arent so clear in other units. and the counter to a unit doesnt do much damage to it . I think your problem is you make changes over historical accuracy rather then gameplay.