I recently got a G&L ASAT thinline. I love the sound and playability, but today I tried adjusting the intonation.... I'm having trouble setting the intonation on the G string - the bolt that holds the saddle is too short. The neck is nearly straight, slight relief - action is set nicely. Open/ 12th fret harmonic is perfectly on G, the 12th fret is showing up flat on my tuner. I shortened the scale (loosened the saddle bolt) as much as I could without the saddle falling out, and fretting the string on 12 is still slightly flat. In order to correct this, should I go to a thicker string gauge, or a thinner one?