I think ideally Ostheer mainline infantry should look like this:
- LMG Grens same as now, as long range defensive specialists that are okay at A-move attacking too;
- Osttruppen pretty much same as now, for fast map control and cheap cannon fodder;
- Gren G43 upgrade to focus on close-mid range firepower with 3x G43, but with toned down moving DPS to avoid blobbing;
- Gren VSL upgrade to focus on high durability (but with a slower build up compared to Osttruppen) over firepower with 5th model and STG 44, but with current cooldown bonuses traded for the extra -10% received accuracy. Similar to 7 men Cons.
Then the different squads would all have clear and defined roles. Osttruppen for fast T2 strats, LMG Grens for general purpose, G43 Grens for mobile and aggressive play, VSL Grens for a strong mid and late game with highly durable infantry that can stall for their support weapons / vehicles.
Osttruppen don't come from Tier 0 anymore unfortunately so you can't go fast Tier 2