So it's fine that hard counter for Luchs is Sherman ot T34 but for Stuart or T70 all you need are Volks?
The Volk-Blob-Meta is a problem almost everyone is aware of, and Zooks could be better, i agree with you.
But these points have almost nothing to do with the performance of the luchs, as your initial post was, so please stay to the topic and discuss balance options of the luchs, not of other circumstances.
Ontopic: I agree with steel that 400 hp health are a bit too much, but personally i favor the T 70 over the Luchs, due to the ability the T 70 gets. I really hate the fact (both units), that they rape retreating squads.
The worst is OKW vs USF when USF player went for Lieutenant.
Thats not a problem of the "OP-nes" of the Luchs, its rather a problem of reading your opponent. If the OKW has constanly good map control, you have to consider an early enemy luchs, going LT is a mistake then. If you went LT beforehand, make sure to deny OKW mapcontrol.