I also have a few of those etched, very hard to see unless you are looking at the surface at a parallel angle. The combo decreased the obviousness of these imperfections but I believe the only final cure will be a rotary and leveling ( thinning ) of the clearcoat. Since they can not be seen at 95% of angles outdoors under normal lighting, I have not yet gone that route.
I do believe several rounds of this combo with a PC will progressively decrease the etching and even eliminate. But why bother if one professional rotary session will accomplish the same goal.