At a loss... Since the person going grape purple did around 65 darken red, 20 darken blue, and 30 lighten green. While I did 20 darken blue, 17 darken red, and 21 lighten green, and got Regal purple, when I was aiming for Grape Purple. So, I went with 10x more darken red, and five more lighten green on my Regal purple. Ended up this morning with Dalamud Red.
What should I add now if I wanted Grape purple? I'm thinking some darken green, and darken blue?