Push up the tab on the kickdown cable. THe tab is on the backside of the bracket. Sometimes hard to get to but it shouls pop straight up. Make sure it's popped all the way up. Hold the throttle wide open. Push down the tab.
BTW the choke doesn't effect the primary throttle opening. It does the secondary if the choke lockout is working right. So choke on or choke off it doesn't effect your kickdown adjustment.