I've got a Harley Benton LP copy and I've got a problem with the G string. All the other strings ring clear but the G sounds like its torn between two notes, sort of distorted. Ive tried all of the set up techniques, the neck is straight, adjusted the string height for fret buzz and set up the intonation, although the intonation for the G, B and thin E will not set up correctly, the adjustment is at the max and theyre still a bit sharp when fretted at the 12th fret.

The strings are Erney Ball Power Slinky if that helps?

Any ideas would be much appreciated........Cheers in advance.