great mod but one question

[Philippus Flavius Homovallumus]

Yes, there's also the fact that with the exception of the slingshot all the projectiles are pointed.

The amount of presure applied to the armour at the Point of Impact is what determins the penatrating ability. Once the armour buckles and deforms job is mostly done.

A javalin has a higher force because of it's much greater mass but it has a very similar PoI and therefore a greater penatrating ability.