You are right arch, they do yellow as they get close to harvest, but why? Look at CD's grow, his girls were real green. The fox farm trio feeding schedule keeps her doped up on N, P, and K. So CD's plants had a steady diet of all. The high P you used for flower may have given yours more yellow too because otherwise you have a very healthy plant, no necrosis on the leave, no def other than N from what I can see. You can even do like an 1/8th tsp flower and 1/4 or 3/8th tsp veg just to get her closer to equal amounts.
That dolomite has helped you tremendously because the MG nutes (I'm assuming) don't have any Cal, or Mag can't remember which one. Normally the plant will have a def in one of those by end of flower too.
It sucks you can't just feed one bud and see how it does, huh?