1992 Oldsmobile Cutlass Supreme mileage: 135,000. This car has been warping rotors within 10,000 miles. I know to use the emergency brake at least once a week, and to keep my foot off the service brake when releasing it in order to allow the rear calipers to adjust properly, been doing this since I got it with 74,000 on it. I believe this to be a problem of design, too small of a pad, and rotor, my Daytona's are bigger. I saw where you mention heat shields, if I remove them will that reduce this problem?
If you have aftermarket heat shields that go between the rim and the brakes, we would recommend removing them. Your brake rotor problem may be due to over tightening the lug nuts or if you have aftermarket rims on your car, they may not allow proper air circulation.