OKW is fine, have they most expensive tanks, the most expensive artillery and don't have early panzerfaust, 66% fuel and 80% ammo can't reinforce points so why need to be nerfed?
Expensive yes, but those units can take an incredible amount of damage and still survive, then no need for them to build more, which mean more ammo and fuel are not needed.
Also, how can a faction have the most survivable units AND the most potent vets as well? The combination is just stupid.