Does your carby have the longer arm installed? (ie the yellow composite ones that comes with the engine, or bolt a hitec servo arm or similar to it) if you are just using the small metal arm that is fitted on the carby you will have very little resolution, and a slight movement of the servo will give a large movement on the carby if you get my drift.

Throttle curve as mentioned is a good idea also to help smooth things out a bit too.

Cheers

Scott.
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Dude , i'm gana call you Einstein from now on . Thats cool stuff there . Thanks