"Just out of interest Father Andrew had already addressed this issue, and he of course used the correct terminology, minor varieties. "
Not sure of your point? Members here have used the term micro-varieties often enough that we all know what is meant. And I think you could in theory easily divide the world of varieties into 3 : major (e.g. H and KN), minor (e.g. 1953 obverses), and micro (e.g. the thickness of a worn 7). FWIW...