I'm with Minn on this one too. If you set the throttle to idle and the RPM drops, the idle setting is rich. If the RPM increases, then the low end mixture is lean.

Lean out the low end and lower your throttle trim. Do it in small increments, and stop when you can give the engine some juice, drop to idle, and it maintains a consistent idle for 15-20 seconds.

I have read all over this thread that Saitos come with a low end setting that is very, very rich and needs to be leaned out quite a bit.