96 explorer sport
 

Could use some advice here. 60K miles on a set of Goodyear Wranglers. I just put on a set of bridgestone Dueler HT's with substantial vibration at around 60MPH.
When the car sits overnoght a falt spot develops and rounds out after a mile or two.

I took the explorer back twice for rebalancing and they tell me that they are fine. First time the balance was off a hair.
No vibration with the wranglers evan up to 80-MPH.
need some help here. currently 62K miles