I like most of the proposed changes except for the schreck change. Sure, greater chance of getting hits, but what's the point if they can always get away with a bit of health left? The more random, but guaranteed kill on hit is more rewarding, and especially in urban areas schrecks might meet tanks at super close range, where the only thing that matters is damage.
Another thing I don't like is the G43 changes on grenadier squads, it's a straight nerf. A squad with two models left would perform worse. Why is it necessary?
I'm a bit unsure about giving stock field healing option to soviets, seems like a core change to the faction.
It would be like giving at least one doctrinal forward retreat point to ostheer. 
Anyway, here is list of suggestions for additional changes:
OKW
- Lefh18 and Pak43 vet 4 and 5 bonuses replaced with self reinforcement and heal, moved to vet 1 and 3.
- Flak emplacement can no longer be decrewed.
OST
- Pioneer squad reduced veterancy requirement replaced with shared veterancy.
- Increase Relief infantry active time from 60s to 120s, cost increased by 50%.
- Fix 250 halftrack lmg grenadiers' vet 3 bonus (still uses RA bonus instead of reduced damage).
SOV
- Combat engineers receive shared veterancy, requirements increased by 15%.
- M3 scout car receives shared veterancy, requirements increased by 15%.
- Increase Rapid conscription active time from 60s to 120s, cost increased by 50%.
UKF
- Lend Lease M5 halftrack can also drop a single med crate for 15 muni.
- Resupply halftrack's vickers lmg drop no longer requires weapon rack unlock (similar to USF M1919).