I was listening to a dealer 'play it and comment on it' review of a guitar. And he referenced (briefly) "The Romero School" in the context of setup and specifically action height. In this case it was 2.5/3/3 mm at the 12th fret. FWIW, it was a Thomas Blackshear CG.
Other than observing that apparently 'The Romero School' advocates a relatively low action on a CG, does anyone have any more information on exactly what this is. Just curious.