To everyone making the argument that Jackson is OP relative to Ostheer, that's just because Ostheer sucks and needs buffs in general which most players are aware of.
The reason (I think) many people believe Jackson needs a buff is it's performance vs OKW.
The way the Jackson handles the KT is a different story, but let's just say that after playing a match last evening where I experienced 5 bounces in a row on it's frontal armor after microing hard to kite it, I am very unimpressed.
This pretty much backs up my suggestion to decrease the damage and increase penetration of the Jackson. This way it will penetrate the heavy OKW tanks more consistently and on the other hand not three-shot Panzer IVs and totally negate StuGs.