If you're talking about the yellow paint, it looks like you're putting on way too much paint all at once. MRP paint is extremely thin, right out of the bottle, so adding thinner to it is only going to aggravate the problem. You have to slowly build the paint up in multiple passes, rather than trying to get immediate coverage. Have you tried just getting the feel for painting with it, without being concerned about keeping it inside a defined area? MRP paint worked really well for me from the start because I have always painted using extremely thin layers in multiple passes. You have to be very light in the application. I would recommend practicing with it on some plastic spoons that you have primered. Beyond that, unfortunately, I can't give more detailed advice because I have always used a single-action Paasche H airbrush.