Imo some of the changes in OKW are in the wrong direction:
OKW trucks. The changes to OKW that make lose tech options when they lose trucks make very little sense. It will force OKW to place trucks inside the base sectors.
The only change we've done with respect to trucks is the T4 truck.
T4 costs considerably less to setup. Thus, even if you lose your truck, you can still setup a new one and still get access to Obers (which you will need post-Volks-nerfs) and JP4 (which you will also need, given that you are now on the defensive after being pushed off).
If you had previously researched the T4 assault group upgrade, you can also, still, skip rebuilding T4 and go for a King Tiger.
Losing access to the revamped Panther and the revamped P4 are part of the risk-reward deal; if you place your T4 too greedily and lose it, you have to play defensively while you recover.
The changes to T4 pricing are so that other recovery options become available, rather than just King Tiger.
VG main issues are not dealt with. Those are:
1) The St44 upgrade making them too potent at all ranges. Weapon upgrades should increase the performance of the unit at all ranges all the time.
2) Ability to build cover. VG are too strong as unit to be able to create green cover.
3) Incendiary grenade. This type of weapon should not be available to mainline infantry.
Is this still your impression after using Volks in the mod?