It's not trigger control, if it was the other 5 wouldn't be there. It's anticipation that's causing that low left shot.
Try this take a dot, any dot, using a delayed beep on the timer, start the timer, take a sight picture on the dot and prep the trigger. When the beep sounds pull the trigger immediately, shot should break around .20. If you have poor trigger control the shots will be everywhere, if your trigger control is fine (you'll be pulling the trigger as quickly as you possibly can) then all your shots will be on the dot. If you hesitate and then pull you will throw the shot because you will not be reacting to the beep but to your own perceived idea of when the gun should go off and you will get a preignition push from anticipating the recoil.
Try it