Face Hardened Armour

[noxious]

Many tanks had FH armour, often those with thinner armour like the US M3 halftrack. There is also differences in armour hardnees without FH. Some being very hard and some being very soft. Different ammunition will react differently to different RHA hardness as it will to FH.

Also, why should tank benefit in game against all guns when FH only gave benefit to some ammunition fired by the same gun?
6-pdr British gun firing APCBC penetrated more FH than RHA but same gun firing AP penetrated more RHA than FH. Why should British gun be punished?

I think you play the wrong game. Play the matrix game, that has much more complicated penetration program that will make you happy.

Nox