Did you get a wheel alignment afterward?
Edit: missed that you did that.
Did you align it yourself, or was it done at a shop?
Did you change wheels at the same time, for winter? If you did, make sure the hub bore is correct. A good buddy bought a set of spare alloy wheels/winters from Volvo when he bought his wagon, and the hub bore was different by a tiny amount. Volvo had made a slight change to the hubs a model year after his, and nobody at the dealership caught it. Very similar vibration issue.