Simple make Wolverin non-doc, so Jackson can become a heavy-counter only e.g. Panthers.
Then give StuG G the option as stationary AT-option (as MaderIII in CoH1) with 62,5 range (as hull-down, the 2,5 range extra is needed so it can shoot back).
Then Jackson gets worse acc. and maybe dps so Panzer 4 performs better.
CoH2 needs more non-doc options, that is one mainproblem, the Commander-System is bad.
We can then also nerf panther rate of fire and accuracy and buff its penetration, so it isn't counter-it-all tanks as well, but a heavy tank/high armor counter, StuG and JP4 will see more use, everyone will be happy!