we are talking about a 50% increase in fuel and munition income for OKW. The okw panther for example is better than the wehr panther because of more accurate main gun and better mg. Now that the income is equalized there isn't really a good reason why the OKW panther should still be better.
The King Tiger is almost trivial to tech for considering its power. It is no longer the mythical beast it once was.
The ostheer panther simply needs too much tech to unlock, he should be buffed tech cost wise, nerfing the OKW panther is not the proper approach towards that issue.
The KT still costs more than the other heavy tank, fuel wise and tech wise.