I didn't read everything but I think going through the exercise of making a chart is probably good because it forces you to think about hands/position etc. That being said I wouldn't use one as a rule.

my 2 cents - I would polarize my early position range more and cut it down, cut out the K-J Q-J crap and add some 7-6s type hands instead. I would also open much wider from the button/cutoff - open raise from button should be like 50% in my opinion.