I've found a potential fix for the issue with lackluster Armor Piercing ammunition performance in the game.    First and foremost this isn't a comment on the actual Damage Model. Frankly the damage model itself is excellent. The fact you have managed to create a model that spans WW1, Tanks and WW2 is a fantastic achievement.    I think I've finally understood the issue we have with AP ammo having flown in FC for a bit. Jason's comments below we're a really good insight.