I think all that needs doing is for HT to look at the armour on the Sherman.
It seems a little tough compared to what you read about them.
I've actually found it harder to pop a Shermans turret with an IL2 than a Panzers.
Funnily enough most of the time it isn't the turret that goes but one of the tracks.
Of course a bug might have also crept in during the changes in this version, from the README -
Reviewed and revised modeling of various tank guns including penetration, damage, rate of fire, velocity, projectile weight, etc.
Modified the effects of obliquity on armor penetration so that it has slightly less effect on penetration