For the western Allies
M10 Should be moved down to BR II
M18 Should be moved down to BR III
M36 should be added to BR IV
For Germany
StuG III F should be moved to BR II
Jagdpanzer IV Should be moved to BR III
Panzer IV/70(A) Could stay at BR IV or could be moved down to late BR III (Just because the chassis is awfully bad in my opinion, but the cannon does work perfectly fine at BR IV.
Panzer IV/70(V) Should be moved down to BR IV and given APCR ammo.
I think the SU thing from the soviets is BR IV and I think it is good were it is.
I don’t play Japan so I wont say nothing about their stuff.