Mecrofeeding: The Way to Chocobo Color Dyeing

[dioxideUniversa]

I'm having an awful lot of trouble with this. At first I was stuck looping between Deepwood Green and Marsh Green (3x each actually,) then I managed to get it to change to Kobold brown. OP suggested 1 plum, which I used, and that put me at Ink Blue, which needs up to 6 fruit to get to Soot Black! I don't understand this system :/ How can putting in 1 fruit = 6 fruits of error?

It's not really costing me a lot in the way of fruit/gil right now, but I'm really frustrated with how much time this is taking when it's so theoretically "close."

Kobold brown is identified as (50, 34, 28). A plum is -5/+5/+5 which puts it (theoretically) at (45, 39, 33). Soot Black is (45, 43, 36,) so all numbers are within +/-5. Instead I get Ink Blue, (27, 32, 40), which is a difference of -18, -7, +7 (just from one fruit!) Is the RNG really that bad?