I have not read this whole thread but instead skimmed for deepwood, since this is the cycle I am stuck in. I decided to try something and I haven't seen it mentioned anywhere. If you unstable prior to a change it "resets" the timer and the color. So I fed him 1x valfruit and 1x pineapple but surprisingly I got no proc message. I played around some more and decided to unstable and re-stable to reset him and try again. So I started by feeding 1x valfruit and 1x pineapple (the same thing I did first, with no proc) and got a proc.

lolwut

All I can come up with is each rbg value is rolled per feed and is limited by a range. Perhaps it randoms between 3-5, or there is a chance to "crit" a +1 or -1 to the feed?