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1st step in any ride disturbance troubleshooting is check tire air pressure. 29 front & 36 rear. IF rears are already @ 36psi I would set at 40 psi & check for any changes the next morning drive. You have changed from the best quality tire to a lower quality tire with a softer tread compound so it will be more likely to have cold weather flat spots. If the increased psi reduces flat spoting this may well be the only issue you have. Keep in mind extra psi amplifys imbalance issues so you will have to find a happy medium. I only buy Michelins & they will flat spot overnite if cold enough also. Tell us mileage on your car, what wheels & what size tires ? Do you still have Pilots on front?
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