This is a very tricky part of setting your Heli up. I had the same frustartions, the Heli was running perfectly till one day it decided to start spluttering. I would say that if you have the factory recommendations start there, else I agree with bconway on his settings. One very important thing is that you need to have patience and not make big adjustments. I learned the hard way, it took me longer to get it right making big adjustments rather than 2 clicks at a time. I also found that recording the settings helped me a great deal because I could then look back and see I had already done and tried. It sounds like you have it too rich at the moment, 3 turns is a lot.