You may be surprised how much of a difference this kinda thing can make. I'll tell you my experience with trigger pull follow through:I'm sorry, I don't understand. Hasnt the bullet already left the barrel by the time your finger is past the break and is proceeding to press the trigger further toward the rear after the round is fired?
Shooting with the M16 at Parris island in 2002, I started off pulling the trigger until the shot breaks during my "natural respiratory pause" then immediately letting go. A Drill Instructor smacked me on the side of the head several times while simultaneously screaming "FOLLOW THROUGH". I began squeezing until the shot breaks during a "natural respiratory pause", and then holding it until I began the next breath. I IMMEDIATELY cut my groups by over half.
There are several things that can be done after the bullet leaves the barrel that will unbelievably affect accuracy. These are things that generally affect shooting form, and not so much the actual trajectory of the bullet.
Lifting your head immediately after the shot breaks to try and see where you hit is one too. Once I broke that habit, I went from sharpshooter score to expert score.