OK, I see the game you are playing. The graphs show up poorly on my screen. But my general position is
the same. The Zone System is only what you want it to be, unless you think Minor White or Ansel A. were Moses and wrote the rules on stone tablets. You can think of the dynamic range of films subsisting
between Zones II and VIII or III and VII, or 0 to XII. I just depends on the variables. If you "standardize"
on a film with a modest straight line section, then adapt you model to one with a long straight line, you
either change your vocabulary or break your own rules. And real world exposures rarely correspond to
what happens with a step tablet.