I would Fix the grooves in the slide. On my trike I have just given up on getting the idle right for all conditions... Can you reach the idle adjustment screw from your riding position?What I do is. when cold use choke and kick it up.. use the throttle to get it going and adjust the idle screw for smoothe idle...as it warms up I let the screw out for smoothe idle...as I ride sometimes when I stop it needs a little fiddle to stay smoothe. I have a custom carb and everything else and this works like a charm. Once you get used to these small adjustments it will run ok.
Sam from Florida
1985 BIGRED $ 200X