I had the same uneven wear and shimmying issue - and thought that the Pirellis were poor anyway. I did not take the Avon route, nor Toyo as the latter are a bit too soft and track biased for me. I settled on Vredestein Ultrac Sessantas, which I love in the Aero. No silly oversteer, very good in damp conditions, solved any wobbles and even improved the ride. Had their predecessors on my Porsche 968CS and similarly found them very good.
