It sounds like you have a bad set of tires. If your feeling a difference in the the tire performance between cold and hot during normal driving use, I think you have a bad set of tires. How many times have they rebalanced these tires for you and you still have a vibration problem. It sounds like a belt shift issue to me.
When the tires are cool jack the front of the car up and spin the front tires. If the tires are OK and not out of round, drop the car and take it for a spin and try to get the tires good and warm. Then jack the car up again and spin the front tires and see if they are still true and round. If you see small bulges in the tread of the tire you probably have a belt issue.
They should be able to warranty these tires for you, maybe have to pro-rate them.
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