"Guitar meticulously tuned to concert pitch, with attention to the 12-15 fret area"
When you need to pay attention to anything outside of open string, fretted 12th, open harmonic 12th fret (and fretted 24th if you have a 24+ fret guitar) for intonation, it's time to get the guitar to a luthier for setup maintenance. Something else is drastically wrong in the setup.
When you're deciding between a 6, 7 and 8 cent pitch shift, using your instrument as a reference, you should pay attention to the notes you are using, no matter how confident you are in the intonation.
When you need to pay attention to anything outside of open string, fretted 12th, open harmonic 12th fret (and fretted 24th if you have a 24+ fret guitar) for intonation, it's time to get the guitar to a luthier for setup maintenance. Something else is drastically wrong in the setup.