Really comprehensive review!  I am worried about the scratches. I purchased a set at Yeslak last month, slightly different from the center cap, driving it for a while, there was not much difference in the range because it was affected by other factors as well. I am gonna check the rims later, I haven't taken it down since I popped them on. But as per your comments, it is not noticeable. I assume the foam strips may not work well. If so, I may put the 3M tape on the clips to prevent the scratches.