Modified Armour Training

[gwydion2]

I'm trying to create a class abilty similar to armour training, but adding AC to the armour and not giving the ability to move at normal speed.
Obviously I started with copying Armour training and modified from there.
I removed the speed adjustment portion and looking at the relevant area of scripting for armour check and max dex, I tried a simple approach first, adding the lines in red below.

field[abValue].value += field[xCount].value
field[abValue2].value += field[xCount].value
field[abValue3].value += field[xCount].value

~ Improve the armor check penalty and max dex stats of our armors.
foreach pick in hero from BaseArmor where "EquipType.Armor"
eachpick.field[arArmorChk].value += field[abValue].value
eachpick.field[arMaxDex].value += field[abValue2].value
eachpick.field[tACArmor].value += field[abValue3].value

This didn't work, but when I replaced
[tACArmor] with [arBonus]
it did work, but not quite how I wanted it.
This increased the armour value of any armour by 1 but also increased the hero's natural armour bonus by 1 (per training level).

This seems to be getting somewhere, making me think I'm close to the answer, but I'm not sure how to fix it so the armour AC increases but not natural armour.