My HBII shipped with 11's with a wound G. Right away I had it set up for 10's, but I decided for my luthier to leave the nut alone (for now). How necessary is it to adjust when going down in gauge size? Should I replace the nut for 10s? Other than tuning issues, what effect could not replacing the nut have on the tone? Can it contribute to twang, buzz, sustain, etc.?