PLUS, I am surprised it has the same exact reload rate as the M4A3 75mm gun, the ammo for the 76mm gun is substantially heavier and longer. I dont have the exact weights or measurements handy but I will get them. I think that should be modeled and currently it isnt. No, I dont think it will make much difference, but right now the rapid reload and the good penetration of the 76mm gun make it top dog amongst all AH tanks but the Tigers.
There was a discussion on this very topic a while back. The "problem" is that the published data of the two guns indicate they both have a maximum fire rate of 20 rounds per minute iirc. While intuitively the larger, heavier round would slow down the fire rate (especially in the case of sustained firing), the published data given in that thread didn't support that intuition.
Looked at in the opposite direction, a
lighter round wouldn't necessarily
increase the rate of fire, because of physical and mechanical limitations. There is only so fast a normal person can slap a shell into the breech after the gun recoils and opens, regardless of the weight of the shell. So the proper question is whether the larger, heavier shell is
large and heavy enough to force a loader to slow down. The published data seems to indicate it is not, at least not in a short period of time (say when pulling ready rounds).
But if someone finds an authoritative source that conclusively indicates the ROF in game is too fast, I am sure it would be adjusted.
And as to the OP, I agree the perk on the 76 seems on the light side. It should be at least equal to the T-34/85 IMO.