hmmm I should have written that I tried the studio fix powder. I think i might be in the middle like you. i can't mix the powders but I wouldn't go through all that trouble you do. wow. that's a lot of work.
When sephora, chanel, or Dior people match me i'm always in between 2 shades. there is never a perfect match and I only would use the powder so I can't mix them. It's probably why I don't bother with foundation to begin with. I tried to be matched with Urban Decay too. they said I was a 2.0 in the naked skin but it didn't match up the same with the powder version. I also tried the Sephora camera thingy but that didn't work at all. the shades it picked were all over the place. There must be an easier solution for you. I wouldn't have the patience for 4 different products
U know what would be awesome? If there was a cosmetic company that would custom make foundation colors for you! Like when u go to a paint store and show them a color u want they mix it for u. why isnt that a real thing? Like the Lip Bar but for foundations!!! I swear i wish i was rich i would so make that happen. I hear this all the time that u ladies have a hard time finding a match.