Well put. I may wind out using just two settings. One being for myself only and one neutral. Quite frankly, the only person I know currently that would be able to tell the difference aside from myself is my father, but he's half deaf. Put him in an isolated room and he has very discerning ears, but if there is any background noise at all then he can't tell what's what. Due to this it would obviously be pointless to accommodate him for an automotive application - if I own anything noisier than a Rolls Royce it won't do him any good.
I think I will push my focus from this area to another.