Mmmm, I feel everyone has valid points here. I personally think the M36 is alright. Disappointed at the occasional bounces off heavy/med-heavy armor but they're still really good.
If i remember correctly, they used to do more damage but less penetration which caused even more deflections.
Maybe a small bonus to pen against heavy armors would do the job.
I feel this wasn't as big of an issue in the past because volks blob was harder to maintain until 100% resource. That's usually their biggest weakness and super TDs. But elephants and JTs are supposed to counter them so I think it's fine. USF's weakness was lack of reliable arty until CalliOP came about. Instead of fixing m8a1 howitzer and major's arty, they just gave a payable commander to overbalance USF's weakness.
Sorry for the long message. I just kept typing what I thought about it