The 76mm, E8 and Dozer Attachment Sherman all fall into the premium medium range: they beat P4s and lose to Panthers.
The Easy Eight and 76mm sacrifice their HE shells for this, and therefore coexist nicely with the stock Sherman.
The Dozer Attachment does not. It's like one of the crazy suggestions you get from the faction fanboys, except it actually got into the game.
I am usually quick to call for USF nerfs because the faction has plenty of OP stuff at the moment but the Dozer Sherman is fine after the WP round nerf. Never found it to be problematic. They still can't reliably pen OKW P4s or Ostheer vet 2 P4s and the extra armour doesn't really help against Panthers and AT-guns at all. And because they are slower than regular Shermans I'd say the survivability is only really better against P4s because getting out of AT-gun range or escaping from a Panther is not really less valuable than surviving one extra shot.
It's also not really true to say the 76mm and Dozer Sherman beat OKW P4s. Against the OKW P4 it's a pure RNG fest because of the high armour of the OKW P4. They have a clear edge over the Ostheer P4 but that's about it.
If possible just give the Dozer Sherman a bigger target size than the regular Shermans. That would make a lot of sense.