I was checking my intonation the other day and I found that my open notes and twelvth fret harmonics are right on, but my fretted notes from the twelvth fret on up are just slightly flat on each string.(Using a Korg digital tuner) I can play two note chords(I,V) on any combo of strings above the twelvth fret and they sound clean, but the single notes are a little flat. They seem to be equally flat on each string. I believe I read somewhere that moving your saddles toward the nut corrects tuning that is flat, and toward the bridge corrects for sharpness. Anybody out there with a similar problem or an idea on how to correct it?