Ostheer just got a 100mp reduction for their T2 structure, I wouldn't give any more mp reductions.
Instead, with the mainline buffs for Sov and USF, I'd just keep your composition at 2-3 Grenadiers max and back them up with infantry which deal more damage for their cost like Assault Grenadiers, (G43) Panzergrenadiers or Stormtroopers. I get either overwhelmed or outtraded in the lategame if I solely rely on LMG Grenadiers as infantry.
Actually, certain players like Brosras, Jae, Nicko and Stuve like to skip T1 with double Pio + double MG42, rush out Pgrens, 222 and Jaeger Command Squad and give their 2-3 Pgrens G43's.
Fully agreed from my level perspective. I also feel grens are simply unable to scake well and don't build them. It's sad though because it is a house of cards ost composition.