Okay, so here is an updated/adjusted version of my previous marker brush. [link]
Basically, it's softer, and I messed with the saturation and color purity, as well as the texture scaling and depth. You could probably do it yourself on the old one, but thought I'd post this, as I have both presets saved.
EDIT: EITHER USE V3 OR CHECK THE COMMENTS; ONE OF THE POSTERS MADE THE TEXTURE SEAMLESS, SO REPLACE WITH THAT ONE.
I think it'd be easier if you edited your description to contain the link one of the posters left instead of making people look through all 79 comments. Just thought it might help. Maybe I'm slow but I didn't see it.
[link] credited!
it's nice but than not for fast strokes like mine. it tend to slow down Dx but other than that, AMAZING!
[link]