Re: RG652 neck/string issue
No fret can be cut past the edge of the fretboard, they are shaved on the edge. It's a winter build that has widened with the heat and humidity, and will shrink back in the winter. I love winter builds.
42mm nut is not an option, unless you think you can find a 430mm radius top mount, best of luck.
If you move the saddle over it will just touch the B saddle and you will get saddle buzz, which you absolutely do not want.
If your only problem is with the high E shift the neck so the low E is closer to the edge. Technically it should visually look like the low E is closer to the edge anyway as technically it's the center line of each E string that are supposed to center the neck, I do prefer the visual alignment which is usually never an issue to anybody with these wider necks.
That somebody would have trouble with these wider 58mm heel necks is kinda ironic as many complain they want their old narrower 56mm heel necks back [which never left enough string room to the end of the fret].