556alpha,
Worked as a service adviser in the early 90's for Mazda. The top of the line 929 had horrible rotors. We replaced all four on untold amount of cars, again and again. No new products were available to us, so we kept replacing bad rotors with more bad rotors. Tons of very upset customers, even with free warranty replacements.
I would use my warranty and ask if the new rotors have different part #'s from the OEM ones, with which you are having problems. Most parts, once installed, normally have a 12 month warranty, even if your extended warranty ends earlier, so new problems should be covered too, up to a total of the original replacement warranty period. May want to place the Chinese rotors in the closet, for an out of warranty future date...You paid for the warranty, use it. If not. the warranty company just made money without responsibility, and that's what they want...tp