Most do NOT have any problems with HF powders right out of the bottle. HF red is the go-to powder for many....both ESPC and BBDT. Most whites and yellows of any powder will will not cover dark surfaces....just like paint. The resin is still there, the pigments just do not hide as well.
I use HF white and yellow to mix with other powders to get a wide variety of colors and effects.
I personally will never spend 8 hours grinding anything. You already have the ball mill which puts way ahead of the game $$ wise.
Matte black (or any matte color) generally kills most if not ALL the very tiny static charge in BBDT process. It works GREAT with an ESPC gun. Ninja black is my standard color with HF black. I have found when I mix black with any other BBDT color, the color coats the BB's and boolits and the black powder is left in the container!
Let us know how your grinding mix works!
bangerjim