Why are peope saying to use feeds that "lighten" to go up in numbers and feeds that "deepen" to go down? I've been doing the opposite and it's worked right on the dot for me.

Started with Desert Yellow.
Fed him 3 berries and got the new feathers message, and stopped.
He turned UI Brown.
Fed him 3 or 4 more berries, got the message and stopped.
He turned Gobbiebag Brown.
Fed him 2 more berries, and once again got the message and stopped.
He turned Shale Brown.
Before I left for work, I fed him 2 Doman Plums to bring down the red and bring up the green and blue. If I'm right, he will be 1 of 3 possible colors: Meadow Green, Corpse Blue or Lavender Blue.

If "deepen" feeds actually brought the main color DOWN, and the 2 secondary colors UP, there's no way I would've got those brown colors according to that chart. I'll post back in 12 hours when I get off work.