I have had GT arrows wear the plastic nock then wear a grove in the shaft after repeated shooting. No dough this is causing a weakness and might be why we hear of nock failures.The new alum nock fixes this problem but wears the deck channel of your bow.
My question is for you guys shooting the Carbon Express arrows. Are you seeing this wear on the back of your arrows. If you are how bad is it. And a guess as to how many shots until you fill un-safe.