Sherman v Pz IV, is there a rating problem?

[leonard]

Nothing is linear in this question. Nor the kinetic energy versus armor thickness nor the die differential to kill the armor nor the two 6-sided dice probability effect.
For coherence, the Sherman versions used in 1944/45 might be updated to 4 armor factor because of better armor and ammo wet storage. But it won't change the world anyway: +/- 1 on the result will not make a big difference.