yea.  The idle screw sets the slide height.  Slide height should be set to about 3mm high then never touched again.

Once you set it correctly, it will probably start loading up down low too.

It's worth mentioning to make sure your throttle cable is adjusted so that your slide sits perfectly on the bottom of your carb and has no slack.  Unscrew the idle screw to allow slide to go all the way down then adjust the cable as needed.  then set the slide height.