then it would just be turning the jackson into the Firefly. We are just digging a deeper grave for variety.
this is why I suggested giving jackson better survivability by giving it smaller size, sight, smoke, and rotation, instead of buffing the HP.
The thing is, i don't think there's gonna be time nor space to test another itineration of what the Jackson is supposed to look like. The Jackson currently is a FF, which is more or less what USF needs for the late game. For cheap, mobile AT, they already have the doctrinal M10. If USF had been thought to have some late game transition, it would probably would had upgrades for the Sherman, but that's has been settle down to be a commander slot.
Right now you are juggling with having a proper TD which can tackle heavy armor vehicles, while not been 2 shotted by them (which was basically the reason Jackson went to 640HP instead of either 560HP/600HP). Maybe 600HP should be tested, since the heavy long range TD had been nerfed against mediums, but there's so much HP you can reduce if the tank is meant to cost 400mp 140f purely AT.