The insane price-efficiency of the 222 is something that is completely ridiculous. At some point it will have to change. CoH2 is a game about trades. Usually when you want to counter something expensive, you have to pay some premium to have a good chance. 222 is a tool that allows Ostheer to completely chicken out on that part of the game.
However, I wouldn't touch a thing about the 222, yet, until somebody would present me a credible alternative for Ostheer early game that will help them survive the light-vehicle meta. Even though OST is supposed to be the defensive faction, it wouldn't hurt them having access to some early aggressive tools (which they have to pay for).
However, even before that, I would give priority to wiping the call-in meta off the map, first.
Then boost the other aspects of Ostheer so it's less crutching on snipers, 222s, and call-ins? I can't bring up every topic on the faction for a single unit.
Let's say we did boost Ostheer's early game, would 222s then be too powerful at that point for their cost?
I think it would help if you could elaborate a bit on your vision about Ostheer.
(The other thing that's completely ridiculous about 222 is the multiplicative stacking of spotting scopes & Vet2. This completely deletes the fog-of-war mechanic)