I usually adjust action by ' feel '
I lower it at the bridge untill you almost get fret buzz
if the action is too high on the higher frets, 12th 13th etc - I tighten the truss rod
If the strings buzz on the 1st,2nd,3rd, 4th frets - I've overtightened the truss rod
if you always take the lazy route
The Devil knows your every move ![COLOR=RoyalBlue]