Never had the plug foul. It will spit little black dots all over the bottom of the plane and make a mess. After the first gallon, I lean the mixture down to normal and switch to 40:1 Stihl Ultra (in the gray bottle).
As far as how to fly it. Just fly it as normal. If you do some extreme stuff like prolonged hovering or wide open all the time. You might ease into that. But for the average pilot. Just get it close and fly it.
David