1. Flak Timing is pretty much unchanged and only Luchs comes 1 minute to early. Reduce the starting fuel to 15 fuel (2 minute delay)and thats enough for the tech delay.
2. You seem to forget that the Kübel has weaker stats than in the alpha, where its dps was touched. With this changes(which I personally don't like) the Kübel can be still viable in every game stage as an harassing unit which is good. Heavy Kübel builds are easily countered by hand held AT and every light vehicle.
3. Grenades are on the same cooldown timer, means you can't spam nades every engangment. OKW needs the flame grenade to clear garrisons. But I agree the flame nade on the sturmpios seems to make more sense.
4. I rather would like to see schrecks moved to another squads, (either dual schrecks on sturmpios or a special tank hunter squad) and give Volks a 3x Stg 44 upgrade.
5. Vet 4 & 5 were nerfed, OKW armour is on par with allied armour cost wise. That was the main issue. OKW pays more to get units that are just as good or weaker than their allied counterparts (except for JP4).
6. OKW has no caches, so they have salvage. If you want to remove salvage, you need to give them caches, since every faction has them. YET this all won't happen because salvage is in 2 commanders.
Flak still comes faster then it used to due to the 100% resources. Still I'm more worried about the luchs, atleast flaks can't be too aggressive.
Kubels still have plenty enough DPS if spammed, trust me they will be spammed. And when your ally gets his entire army wiped by a single M20, you will want it changed too.
Also the caches cost manpower. Salvage is completely free. I wouldn't say anything if it was and upgrade or something, but right now it's essentially free resources. For a faction that gets just as much resources as everyone else.