You are definately running lean and too little nitro. Was this fuel recommended by someone or was it a "I think I'll try this one" type of purchase? A low nitro content(0-20%) is normally good only for aircraft engines. What kind of prop is on the boat? In this I mean brand, material or anything else you can tell us. Have you done anything to the prop to sharpen or balance it? All of these can be causes of poor running. Something else you need to look into is finding a club so someone with experience can help you. We can only help you so much, while an on site helper/teacher can see what's happening and help you avoid some of the problems you're having.