You are probably running too high on the PSI, compensate by not thinning the paint so much. I usually thin about 25% to 30%. Move back to about 6 inches. Don't try to get solid color on first coat - don't pull back all the way on the trigger, only about half way or less, just dust it then wait a few minutes then dust it again. Build up a few layers to get color density. I've used a Badger 150 for many years and it does take a little while to get the hang of it but it is a very good brush. Do not lose patience - keep at it and you will get better. Another thing to try, take a piece of card board and try to draw fine lines, squiggles or circles. Do things like they teach little kids that are learning cursive.