Originally Posted by Exzite1
I second psv255's comments.
The swing-path and shoulder set up seem to be for a standard first serve. If you want more action on the ball, you should turn your shoulders more away from the target and have more of a brushing motion at contact. You can either alter your stance for the second serve, or consciously turn the shoulders further away.
Your mechanics look strong, but if you get more brush, you'll get consistency by trading some pace for spin.