Your posture (i.e. head and spine tilt) is too much for my liking. The best pitchers in the game keep their head upright. Also, your posture is inconsistent from pitch to pitch (some pitches have more tilt and some have less).
You also fly open with the glove arm. This may be causing or contributing to the inconsistent posture.
These issues can affect repeatability, control, movement and possibly velocity and health. Do you ever get sore on the inside/front side of the elbow or shoulder?