Yeah, there's really no way to trim the mounts to make the car lower. That big center nut tightens against a round metal platform that is "floating" in a mass of hard rubber. This metal platform is sitting right on top of the strut bearing and spring hat. So there's nothing you could trim or shave in order to lower the car. The only way to lower the car would be to somehow heat up the rubber and deform it so that the floating metal platform could be pushed up higher. But then, the longevity & stiffness of the mounts would be harmed.
As for Chris' mounts, I still can't comprehend why they're loose. The chrome strut rod has a D-shaped tip, which corresponds with a D-shaped hole in the strut mount. Therefore, as long as the nut is tight, there should be no way for the rod to rotate against the mount. McPherson strut suspensions are designed so that the chrome strut rod rotates within the strut housing, not within the upper strut mount.
Anyway, I'm going to be busy Sat until 4-5, but if Chris is down in Carlsbad I'd like to check them out and see what's going on.