OK, so, update. I gave the engine to a friend that repairs full scale aircraft and he happens to have an ultra sonic cleaner. I don't know what kind of magic that thing is capable of but it fixed what ever was wrong with the dumb engine. 10300 RPM rock solid now. Put 3 flights back to back on it and not so much as a cough. I would love to know what cleaned out of there that I didn't get, cuz I took that stupid thing apart at least 5 times and cleaned every part with kid gloves. Oh well, it runs great now.