See, there are all different ways to do this and get the right end product. Some don't base coat, some do. Different brush types mentioned and so on. Bottom line is.....practice. I did see a good comment about brush height. That is something else you will have to learn what is best for you. The larger the area I paint, the higher I am above the jig, and more powder I use in the brush, then the opposite is true for me also. I got thick full brushes, and some cut down for smaller areas. There is nothing wrong with those jigs in your pics Bud.
It's funny, I have been using paint brushes for years, but never for what they were made for lol. I use to have brushes with 1 or 2 bristles on them of r painting eyebrows on the little people when I was doing model train layouts. Never could paint worth a crap lol.