I've always wondered where Scat 3-26 were? I built Scat 2.
Splatter in my experience is usually caused by too high a pressure. The only way to solve this is to set aside an afternoon, get a bunch of test subjects like rent signs, a bunch of paper cups to mix paint/ thinner, and just go thru all the combos until you find what works for you. Paint by paint.
Seriously, there are no certain answers. Too many variables.