Jerby relax, archers are not armour piercing.

Anyway I'm inagreement with Red Harvest about the changes, in fact we more or less worked them out together.

I would at the very least up normal javelinattack to 9, and elites (Illyrians, Mercs and Heavies) to somewhere around 11-12.
The elite archers I would completely recreate, making Cretans the best (attack of 9) and less likely as mercs, the others decreasing in effectiveness, ending with Auxilia Archers who would be normal archers with long range. Also I would up the upkeep of archers compared to javelineers (perhaps not compared to the elite javs).
And most certainly I would change the name of the Hevy Peltasts to Thureophoroi (I find it strange that they have not gotten that name since the Thureos is mentioned in their description, compare to the mention of the Pelte with the Peltasts), and make them tougher in melee. They deserve it.