I don't know what chopping is but should not be doing it. I have nearly 40k on set of Toyo AT, have only rotated 3 or 4 times (never re-balanced), have even wear and expect to last another 10k+. Factory 'toe' adjustment was off and caused wandering - after correction at 5k, drove much easier.
Do you have any vibration, shaking, pulling, vague center feel?
Do you have any vibration, shaking, pulling, vague center feel?