i thought of gg to guitar connection to lower my action for my epiphone les paul... They said they got to file the frets.
and again double check your nut height.. press the strings on fret 3.. each string should have a height on 1st fret (top of the 1st fret to the under side of each string) about a half of the thickness of each string ...
some ppl do slot the nut untill the height about a paper thick on 3 unwounded strings, and about 2 paper thick on 3 wounded strings