Chris:

I may not be an authority in thie matter, but how low of an idle are you trying to achieve?

It is really not necessary to go down on RPM's too much at idle, since there will be pratically no thrust at less then 1/4 throttle. It soudns to me like you leaned the idle too much. Remeber, just lke any other 2 stroke engine, if you lean the idle mixture you may have to richen the high speed needle a little to maintain constant fuel flow.

David