The question is if 2 KT's are OP. Considering the cost for the okw and the fact their speed makes them the weakest of all the 3 heavies im not sure this is necessary. but at the same time i have no issue if the limit of the KT's are set to one.
Well, unsupported KT is definitely the easiest heavy to deal with.
But with support and considering what that support can be we end up with quite a formidable beast there.
Can't see how anyone would be able to get a pair though outside of luftwaffe supply ally.