I took this strat to a luthier six months or so ago and he did a setup and a bone nut. He did a great job, overall. It's just the high E had an ever slight garbled tone when played open. I just lived with it as it was very slight. Over the months it's gotten much worse. The other strings are all ringing out nice, but the high E is bad. The string is not hitting the first fret and the tree is giving a good angle, and sufficient tension behind the nut, it's really weak and fuzzy sound when you hit the string open, unless you hit it very softly. First fret F note is nice and clear. Can I use something (crazy glue?) to fill the slot and try to file it over? I'd take it back to the guy but it's an hour's drive, and there's really no one closer that I know of that does this stuff.