Da,
i have been dealing with same type of problem for the last 3 months. I have nitto tires and was told anything from u-joints to wheel bearings. I have had the tires balanced now 4 times by 4 diff shops. The last shop had a balancer that i have never seen and had a laser that measured the wheel and showed up a on screen where it was off. I actually have two tires that are egg shaped and in the middle of trying to contact the company to get the tires warrantied.

 

Thanks guy's I'm having the tires re-balanced on Monday, the shop was shut down because of the Christmas parade ( Small town) I'll know more on Monday. They are pretty sure it's the balance. Again Thanks I'll keep a post up on them.