Nope. Under RAW armour is subtracted once from the total value of a volley that hits the ship, not with every shot. On average you'll fire with Strength 5.5, and each one dealing an average of 7.5 damage. Thus if you can get at least three hits on an enemy Rok you'll start doing damage to it. The trick here is that on average damage would go like this.
0=>0=>2.5=>10=>17.5=>21.25 (ha ha! Half a hit)
Whereas with Mathhammer damage would go like
0=>0=>0=>0=>0=>0
But NPCs are probably not going to be scoring a full salvo hit against an enemy vessel, whereas PCs do, which is the original problem.