The last two CPR fields I've installed - Medusa and Fathom - had the "gobs of clear" issue with the star rollovers, and I believe I saw that on a Centaur as well from a few years back. I used to file the clear out of the openings with a very small needle file, but there's too much risk of breaking the clear free from the insert surface. Now I'm using an X-Acto knife to shave out the clumps.