STG 44 volks are not overperforming.
Before the patch that removed P.shreck from VG, people though that VG blobs would be replaced by SP blobs. They did not, because MP44 volks are able to handle most allied infantry adequately and they overshadow most OKW infantry. MP44 upgrade is no brain upgrade that increase the mid and close DPS at no cost other than not being able to picking up weapons. Leaving 1 squad without the upgrade solves that issue.
Obers are more cost effective, but they need vet. Obers suffer right now from not being powerful enough on arrival, and over performing if you manage to get them to vet 5.
They might be if one was able to vet them to 5 but usually that is not the case, or at least in time frame that infantry fights are dominant.
The changes I suggested are very, very slight buffs to shocks. Each one would help their power curve be more even. The problem with requiring them to get to range 10 is that they are not able to do so. They need to be able to do so with good micro. Extending their range slightly will help make them more versatile (here we are talking about 5m).
We don't need many buffs on shocks, just a couple of tweeks to make them a high end premium unit.
Shock have smoke grenades and can move close with good micro. Extending their DPS to 15 would mean the MP44 units or MP40 units would lose to rifle infantry at long range and to smg infantry mid to close making them rather useless.
Imo smg are meant and should remain weapon for close combat 0-10 and not mid 15. If smgs infantry fail to move to that range changes should be made to allow them to achieve that range easier than buffing their mid range DPS.