Did you have a VASL LOG for your game?As Jim notes above the German infantry may have too far to go in just seven turns considering how the set up area can be pushed back to Row D/DD. I still believe the Germans need to upgrade at least some of the Pz IIIGs to H models to have a better chance against the US 37LL guns on the US tanks.
Maybe completely avoid the Forward enemy and just go around them using your superior number in AFV to keep them from retreating.
Its not about taking on the Russian Inf..its about the BUSH!