Hi, it's not 100% clear to me what's wrong with your maps on your video. It's hard to tell what's going on with the region map since you already have a good parting on the hairline. The density also seems to be doing its job, you have hair growing from the white area and no hair on the black edges. Perhaps some screenshots showing exactly what you mean would help?
edit: remeber the paint maps tool is glitchy, I use it with the options open. I always click "save textures" before clicking again bake to ptex. Sometimes if I dont click save textures in the option box then it also doesn't bake to ptex.
