I'd suggest perking every tank which cannon has long effective range

That is just because we don't have *any* cover in AH for the tanks to hide.
Germans sure would love this 'poland' terrain of AH

..while yanks would simply *hate* it.
One of the reasons why yanks did so good with those zippo tanks in normandy, is the blocky terrain with bocages (spelling?)
In AH terrain normandy would be clear victory for Germans, even for PZ-IVh.
Though, kill power of those cannons shooting from long ranges should be cut off.
I really *believe* that one hit kills happens constantly from 4k distance with 75L48...
There isn't many ricochets in AH, most of those that I've seen, has happend from close ranges. (lol, like 200 yards, but not from +3k)
Perking really shouldn't look into the power of a tank though, just for the numbers.
Where PZ-IV and StuG III would be matching with M4 shermans on regular basis, other tanks like King Tiger should be seen rare times than Panther.
HTC should model T-34c or b next and M4 or M4a1 sherman... that would make up some nice fights.
Next interesting german tank would be StuG IIIG or StuG IV, though, utterly tough to use with one driver/commander/gunner.. (no turret)