Against close to 10 conscripts vetting up to vet 2 or vet 3 in no-time?
This is what I have tried, but no matter what you have you cannot fight those huge blobs. If you get LMGs on only 2 grens that's already 120 munitions = no schrecks anytime soon, especially since you lose all map control since the soviet player can just blob on you in any part of the map.
More cons means less team weapons and snipers on the battlefield. There is no need to upgrade to shreks. Ppsh on all cons (and you were talking about 10?????? cons) will take 300 muni out of his pocket. In turn, this indicates lack of munition for soviet player to plant mines or throw at nades in large quantaties. Just upgrade your grens with LMG42, and punish soviets with team weapons.
If same situation persists during midgame, you could get three PIV and push him away. Again, more cons means less vehicles.
IMO, any unbalanced army is easy to defeat. Spamming ppsh cons all day is a wron way to go.