This is most likely a bug. But i would like to remind that the Late shermans on Cobra where equipped with wet ammo racks and various improvements. Things most tanks(including german tanks) dint had. A tank when penetrated is a loss when=
1.the crew is dead
2.The ammo exploded
3.The tank catches fire in wich 1 and or 2 happens
however i think this is most likely a bug. I yesterday got one shotted from about 100 meters by a panther and i managed to survive a shot from quite a long range (Windmill to the slope at allied base)
I think it is a bug
Wow you agreeing with my when talking about allied armor
but I am okay with certain improvements if they are historically reasonable, but as you said those Shermans feel wrong now. I cant think of anything else than bug or a mistake in balancing them.
What i also like to say is , their is really a problem of cover from the German base, especially because the farm is mostly American and there is a 76 Sherman spawning and even a regular own which is always a problem for many German tankers, not because its there Once, but because it spawn very fast.
The Allied got great cover and stronger Shermans, but this together makes it to easy for them in 2.45 I think.
Also the spawnpiont of the 76 Sherman at the farm is quite bad for them, because you can destroy it right away when being somewhere at the railroad. Also its a litte bit of a problem in my opinion with 762 rules, because I am not sure if its allowed to destroy it right away when someone enters it, though it is at a uncap command post.