difficulty attacking as Soviets in Moscow 42

[ComradeP]

Not sure if this is the right place to ask, considering the database came from elsewhere, but why are Guards units weaker in soft attack and assault than their regular Rifle division counterparts, and what does the higher hard attack value represent at this point in the war? AT rifles? If so, why don't they have a separate company per regiment/brigade like some of the Rifle brigades?