If you will inflate the front tire to 45-50psi the cupping goes away. I have over 20,000 miles on mine and it's still going good! It does take away from the smooth ride a little. Well worth the ware!
I'm on my second set of E3s. The first set lasted for a good many miles although the front began cupping with a wobble the last 25% of it's life. This new set the back tire was out of round for the first 20 minutes out of every ride. Dunlop replaced free of charge. The front is cupping badly and now starting to wobble with only 4,000 miles. on very slow turns the tire feels like a knobby. I will not be buying a third set of E3s.
Installing 4th set of Elite 3's with each set lasting at least 20K. I replace them when there is still 2 to 3 K left, which is a personal preference. 135 K on bike.
Second set of E3's and the same wobble and wear as the first set. Thought that the larger 70 rear was going to do the trick. Just orderd a new set of stones for the start of the Phoenix riding season.