The only change I think regarding these two is a slight buff to the damage and penetration of the M10.
The M10 comes at 7cps and so isn't meant to be a heavy tank counter. I feel like the Tank Commander call-ons are there so you can go tier 3 heavy and still get reasonably solid tanks -> M10 + Bulldozer without teching to tier 4.
The Jackson is extremely good vs other armour, its guns already as powerful as I feel you can make it so the only options to buff it vs other armour would be to increase the armour of the Jackson itself which goes against the design of the unit.
I feel USF play similar to CoH USA, your late game involves getting a greater variety of units rather than "better" units like the axis game involves.
