1. looking only at cost its not a good way to balance things. technically the okw has significantly inferior support units and relies on stronger front-line units. now the okw has weaker frontline and support units. no snipers and a shitty mg and leigh. As such vg's need to be as strong as rifles or even stronger.
2. i do not use the puma or m10 as AI anyway.
the Okw doesn't just have stronger front-line unit, they have the best frontline unit. Panther, jpz4, king tiger, and ober are some of the most amazing frontline unit in the game, and okw is no longer crippled by a lowered income. Even factoring in the cost price, it's still a net price decrease for those units.
the days of volks spam is over. Okw need to start using something else. jpz4, luch, stuka, puma, and AAHT still have their old fuel cost from when the OKW's income was crippled and are now effectively cheaper. (AAHT needs a buff, but the other units are great)
OKW should be an aggressive faction that favor strong frontline unit at the expense of their support unit.