am i reading this right?Action at the nut is measured by fretting at the third fret, so that the string is stretched between the second fret and the nut. Now check the gap between the string and the first fret. This should be about 0.25mm for the bass E, the A and the G strings, and about 0.1mm (a piece of paper) for the D, B and top E strings.
That depends what the problem is. In general, if the intonation gets worse higher up the fretboard, then the compensation at the saddle needs to be adjusted.