Let me leave my 2 cents:

Shock Motor Heavy Tactics and Mechanized Support Tactics
This guys overlapping to much:
Both have ISU-152
Both have elite infantry
Both have IL-2M bombing run
As result -
60% of abillities are common. In current meta doctrine with guards looks better due to mark target and guards. They should be like Ostheer's
Luftwaffe Supply Doctrine and
Close Air Support Doctrine (have a lot of common but works differently). I see several variants:
Guards doctrine aimed on anti-tanks purposes, and better suits to player with defence style. Doctrines with shocks should be more aggresive. It can be made with:
- Do something with Armored Vehicle Detection. It definetly the worst vehicle detection abillity in the game.
- Replacing IL-2M bombing run on IL-2M PTAB run
- Replacing conscript repair kit on something more usefull (Vehicle Crew Repair Training as variant)
- Replace shocks with PPSh upgrade for cons. It will help to deploy units with PPSh faster and provide the game around conscripts. Or keep shock and buff them to make the choice between guards and shock not so obvious. In the end, it should be like that
Shock Motor Heavy Tactics