Slides are closed at idle, needle height won't have any effect.
Sounds like fast idle needs adjusted.
Bike runs but idles way too high when warm.
Needles are tied directly to the slide.
Not sure what you mean by the fast idle?
The idle screw adjustments? They don’t change the rpm much if anything noticeable at 4000 rpm. I’ve tried all the way in and all the way out with no real change