Your accuracy level on the tough shots tell me your watching the front sight. The scattered shots tell me your wanting to go faster than your ready to. Slow down and see that front sight on EVERY shot. Your speed will come in time. You may want to do some dry fire excercizes at home with an UNLOADED firearm. Set up a couple pie plates on either side of the room, Draw and dry fire on the first plate. Squeeze the trigger only when your front sight is in the center of the plate. Swing to the second plate and simulate the next shot again when the front sight is in the center of the plate. I know it's boring but it will help in a couple areas. One being, front sight focus and two, target acquisition.