Odd vibration sensation through steering and floor

Odd vibration sensation at motorway speeds, had the wheels rebalanced and no change, they rebalanced them again and still not difference. It is a noticeable first thing in the morning at normal rural speeds the later on the motorway, sometime feels like you have a flat then when warmed up it seems to stop !. I have only had the Goodyear Eagle F1 Asym on for 1,500 miles so hope it is not a dodgy set, the other set were fine.

Any ideas ?

Booking it in for Audi to check.