Carter BBD tuning issues

all adjusting is done warmed up. the choke is closed upon start-up,and opens about a 1/4 when started,and high idle lever holds the throttle at a slightly higher RPM. The choke has to be wide open to do any adjusting of the fuel/air mixture screw. Remember, the choke has nothing to do with air/fuel adjustment. The choke helps start the car, then opens up gradually. only when it is wide open do you adjust the carb.