when the throttle blade is opened and vacuum is present it pulls fuel from the transfers , these are responsible for partial throttle opening, there should be 3 or 4 in a row, then after the throttle is cranked wide open the bolsters flow most of the fuel needed.
close both primary and secondary and open the primary just untill the car will idle, then open the secondary till the idle increases slightly, they should both be pretty much at the same opening at that point.
having one open too much will cause an overly rich idle and bad response.
Al