You may be on to something. The one thing I wanted to try today was a bit more nitro. I took the half gallon of Wildcat 20/20 that I had and mixed in a half gallon of 40% home brew that contains 20% Cool Power synthetic. On the advise of Richard Verano over the phone today I changed the plug. I also leaned the diaphragm screw just enough to keep the transition detonation free. Today I had 3 flights where the engine ran well. Not spectacular but well. I will have to check into the viscosity of the Power Master oil as my plan was to have my buddy that mixes fuel to make up a few gallons of 30/20. I'm hopeful that these changes and a bit more run time will get the engine to settle down a bit more. Thanks for the oil tip, I will follow up on that.