I always warn people to leave the factory mixture setting alone on OS engines. Usually it's close enough, and I set the idle with th EPA (end point adjustments) on the throttle servo. Anyway I don't spend a lot of time idiling, since I'm usually flying inverted making low passes over the runway. Also, I use the trim to shut it off on my VG400. On Futaba computer radiios, you can put the idle on a switch (Throttle Down and Idle Cut).

You shouldn't even TO until you can get your engine to run reliably on the ground. I'd say at least two tanks of fuel should do it. On a new engine, for your first TO, you should have the needle valve set to the point where the engine just begins to two stroke. On each subsequent flight, you can turn it in a click or two. However, don't run a Max engine too lean. The optimum point is 15-30 degrees off of maximum RPM (leanest point).

Ciao,

Eagle Al