These 7-man squad and increased damage in cover does not correspond to the general concept of the Soviets - the attack.
For Osttruppen this bonus is appropriate - because the Wehrmacht a defense faction: Osttruppen can build trenches that protect better than sandbags, plus a reinforcement and healing bunker, plus one of the best machine guns.
For Britain, this bonus is appropriate - it is a defense faction.
But not for the Soviets, conscripts with such a bonus have no synergy: Maxim has poor suppression, no machine gun nest, no defensive structures.
Soviets - attack, but in the attack 7 people with a defensive bonus are bad: several units interfere with each other in their cover.
First of all, general concept of soviets isn't attack, where did you get this idea?
Second, Mobile doesn't mean offensive and static doesn't mean defensive. Assault grenadiers is a high mobile unit and it have great defensive power, it can defend your MGs and mortars of being flanked or rushed very effective, would you better rush vs an MG + Grenadier or a MG + Assault grenadier? Same goes with the fact that Guards are static, but very offensive, Mortars are static, but an ofensive tool.
Conscripts have no synergy with cover? What did you mean by that? unique heavy sandbags/triwire mines/molotovs/merge/PTRS, ourah is a good ability to get in cover faster before model drops, it isn't an assault ability since while being at oorah they can't fire.