Something you also have to consider is softer wood could be a factor but if the clear was hard as rock there is a bigger risk of chipping and cracking of the clear. There is a fine balance and it’s difficult to achieve. And modern pins have WAY more air balls compared to earlier machines. I think about the air balls I get in Metallica and Kiss and there are tons more. New games play faster...harder impacts so there is going to be dimpling. It’s just a part of pinball. GET OVER IT if it’s a machine you plan to play. If you want a museum piece then don’t play it and you will never have to worry about dimples.