I have been living with pretty bad shake on my bike for a while. I replaced both tires with the Dunlop Elite 3 and put a 250 on the rear. After about 5000 miles on this set of tires the vibration has gotten to a dangerous level and I noticed some cupping on the rear tire. It's acceptable at 60-70 mph speeds but around 100 mph it's flat out dangerous. I found a W-rated Pirelli tire for the rear on sale for $212. Unfortunately they don't have a matching tire for the front. My other option is to go with a set of Avon Cobras. They have the matching set available but the front tire is only H-rated while the rear is V-rated. Should I go with the Pirelli and leave the Elite 3 on the front or should I change both tires and go with the Cobras?