Double action shooting is something that has to be developed. Make sure you have enough finger on the trigger. Use the part of your finger between the pad and the first joint. You need a vice like grip. The long pull really tries to pull your sights out of alignment and the gun off target. If your gun has minimalistic grips you might want to get some more hand filling ones to start off with. Once you have the sights aligned and on the target pull on through. Don't pull almost all the way, stop and refine your sight picture, and then pull the trigger the rest of the way. That will make you jerk. Dry firing can really help a lot.