You're also not going to solve the teching issue assuming it is an issue, by simply making the units swapped about an changed to operate like Ostheer equivalents. That's like saying your truck's engine problems will be solved if only you made it look and sound like a racecar.
While I agree that their teching structure has highest risk and vulnerabilities relative to other factions, I believe that is the point of HQ trucks. If you want to reduce risk and vulnerabilities, then perhaps the better way is to simply buff undeployed HQ trucks?
OK, the Ostheer thing, just put it aside. Just put it aside for a moment, ok?
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OK? Good, now let's just talk about the changes I proposed. So if you play OKW, you will have 2 choices: either go Med HQ or Mec HQ (Go both would be suicide so scratch that, ya?)
If you go Med HQ, you will be better at preserving your units and field presence. However, you have literally no good AT units and no vehicles field presence: Raketens just for ambushing and only work well in pair while Sturms is mostly use as mine-clearing since upgrade them with Schreck would be too risky; the Flak HQ is also too risky to buy since it's too costly and perform well only to infantry. Agree? So that's why I proposed change 5 which is move Ober to Med HQ and give them double Schrecks (Simutaneously remove Schreck from Sturm and give them non-doc flamethrower so they are better at clearing building while removes Volks' incendiary grenade and give Volks old grenade back) and buff the Flak HQ according to change 6. This way, you'll have a more reliable/mobile AT unit than actually can be specialized in it, rather than Sturm doing all the hard work.
If you go Mec HQ, you will have a chance in dictating the LVs warfare: early Luchs, Puma and Stuka. However, what about your infantries' field presence? Without the FRP from the Med HQ and the medics to heal your troops, you will be having quite a rough time in maintaining them on the front. Also, the Stuka in this tier seems rather odd. You can get it earlier than any other factions while forcing those who went Med HQ to back tech to the tier that good at mid-game just for the Stuka (after getting Schwerer). Therefore, to help these two problems, I add in the SdKfz 251 half-track to help OKW maintaining their infantries on the front while moving the Stuka to tier 4 so it come by the same time as other factions' mobile arty while allow players that go Med can still gain access to it without having to back tech (All according to change 8).
There, you see, I moved some units, I changed some roles to help OKW picking tiers more effectively. By doing like above, you won't get annihilate by LVs rush tactic or any of those other cheesy tactics that exploiting OKW's "vulnerability" ("vulnerabilities" here are the lack of tools to be able to deal with different threats, which lead to them being overrun by cheesy tactics, NOT the truck structures' survivabilities).
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OK, now imagine the unit compositions inside all tech structures. Just imagine what units are inside different tech trucks... Seems similar to something?... That's it! It seems similar to the Ostheer's unit compositions in tech buildings!
And that, my friend, is why I named it the second Ostheer.
Probably the similarities seem quite lackluster which lead to all of these "misconfusions". My apologies. I wasn't truly think of the name when I wrote the post so sorry...