Why not design the faction around documented reality and how the faction was supposed to have played out in the first place?
MOBILITY AND FLEXIBLITY WITH SOME EMPHASIS ON FOCUSED FIRE!!!
Soviets are more about volume and saturation via near endless excretions of metal, blood and fire. The US is more focused and direct in that regard but less about hoards and more about fire and maneuver. Micro is a big part of this faction but blobs will be blobs...
Soviets=Overwhelming and Indirect fire
USF=Focused Fire and Shoot and Scoot
That's just my over generalization however...
I think the Engine couldn't handle that, documented reality was that 1 German Soldier killed 14 Soviets. To Keep things "balanced" Grens Squad= 4ppl and Conscript= 32ppl
And the US only won because the war was already lost for Germany due to the eastern front.
(I don't need to mention UK and France here,they did nothing)