[purpleRac3r]

A vibration in the steering often points to a front tire out of balance. These very low profile tires do seem a little more sensitive to slight balance variations, especially the run flats. I have a slightly out of balance tire on left rear that causes a slight pulsing vibration in the whole car, most noticable on smooth roads at highway speeds. Perhaps have a different dealer check your car out, or find a high quality local tire shop check the balance on your tires. Eliminate the easy things to check, then dig deeper if that doesn't work. I'm got an appointment for rebalance at a local tire shop this weekend.