Shooting is calibration. Calibration is micro details in place. The difference between an average,good , and elite shooter is in the details of the mechanics.

Finger placement, the spacing between the hands/fingers, the pressure and feel of the ball,and which dominant fingers release the ball,calibrate the shot.

Negative and positive motion in the energy transfer. This is another aspect of calibration. The lift point of the shot calibrates proper arc,shooting touch, and determines if the shot falls short,long or on target. 

Let me explain in more detail. At the lift point of the shot, a lot of players pull the ball back as they are lifting it. This is what I refer to as negative motion away from the target and can affect energy transfer of the shot because the ball still has to go forward. The pulling back motion is one of the main causes of a shot hitch that either causes a catapult, flat shot or the ball falls short. Very few players can make this motion work. This motion tends to create a lot of arm to the shot.

On the other hand when a player lifts the ball and keeps it on a vertical plane, the shot generates positive motion(up and out) and creates more of what is considered a one motion shot. This affects shot trajectory,arc,timing,velocity, and shooting touch. This motion allows the shot to transfer more from the wrist to produce a pure shooting stroke. The secret to the shot is in the wrist.