I really don't see the problem, I just had a game there and my triple vetted su76 still didn't pen panthers and KT's every shot. It's not like 3 su76's are one shotting your panthers or KT's or even getting them down to half hp. You have plenty of time to react and get the hell out of there.
You need to let this wartime thing go, this is a game based on ww2. It's not a simulator. That's why your squad doesn't disintegrate every time any tank shoots near them.
If you want to talk realism, why doesn't a kubel get annihilated by my zis (when I finally hit the bastard)?
Firstly the kubel should get annihilated, anything less is bad design.
Secondly, yes it may not be a WW2 simulator but it may as well be DoW4 if it didn't follow historical realism to an extent.
For me the furthest artistic licence should go is SU-76s killing Panthers. It really shouldnt be killing Tigers and KTs. I mean, there's a reason why the Soviets upgunned their T-34-85s and built IS-2s, SU-85s (which was actually a stopgap to ->) and SU-100s - because those tanks actually have a fighting chance against Tigers and KTs.
Now if the Sovs were lacking proper AT options then yes, maaaaaaybe give the SU-76 its current stats. It's not.
At the same time, I don't want to see Vasilly Zaitzayov (I'm on a phone and don't know how to spell) man the AT role of the SU-76 and a vodka infused gunner man the AI role. Barrage should be buffed with Penn being nerfed. Doing both
A) wouldn't break the unit
B) Give it the proper dual roles it has and should have
C) lo and behold lets the vehicle follow history.
If the SU-76 became this, I would still build it, its still strong early to mid game.
To put it into context, it is the only vehicle that has a maximum operating window from 5th-7th minute to the end of the game as it stands.