In addition JP4 do not push they are TDs not tanks.
same thing for the Jackson if they get their HP down to 480 HP.
puma survival kit is good to get you out of a jam, but it's not going to help you if you go balls down.
I'd say itd be better than what we have now. It would put the Jackson back into a strictly TD role instead of a TD and Dive Tank which makes it so strong. I still prefer a 76mm nondoc unit to act the the USF's Dive/brawler tank. Smoke would be nice also since one of the major issues with prepatch Jackson was that it was super squish and really susceptible to dives or super TDs.
my intent was to push Jackson back into a TD role and buff the sherman 75mm instead.
increase the sherman health to 800 and it can be a decent dive tank.
As a short note, I think the different medium should focus on different attribute to help them scale.
panzer 4 get firepower (pen, AOe) with their kwk40. Provide flexible firepower for the more specialist unit. They lack the armor to stand as the front line but their Firepower make them excellent at deterring flanker.
sherman get hp and armor with their wet storage and improve late war armor. They serve as cost effective meat power for the allies late game
cromwell get speed and evasion. Raiders to support the defensive british.
t34-76 would get a useful ram.