As others have said, just use the oil and fuel you intend to use and just go for it.
I'm not a believer in not using a syn oil from the start. Use what you intend to use all the time. An "oil change" could cause more problems than it's worth. Break it in from the start with what you will use in the future. Break in is not so much a big deal in the gas engines.
Do not confuse these with your old NITRO thoughts. OK now to add more to this I only use Camp Fuel, my Baja has never tasted gasoline......... from day one camp fuel and Amsoil Pro Saber Syn at 42:1........... = 3oz oil per gallon....
BTW, the only break in thought should be the needle settings. Keep it on the rich side on the low and high for at least a tank and then lean it in for max power checking the spark plug color after a high speed run......