Fascinating !
I recently recorded a 12 bar type pattern using G major, c major and D major, for a guy who owned a G harmonica.
I kept a copy of the disc and found I could use G minor pentatonic to jam over it.
I've been playing minor pentatonics for some time and i might have become a bit too used to them ?
I think i''l try and record a minor pentatonic over some major chords, to see if I can spot any bummers on playback.