LOL. Pitching ain't the Olympics...you don't get points for form.One of the reasons we decided to try something different with DD's journey is because we were getting real good at doing drills, but not seeing any carryover to actual pitching.
The way to use drills is pretty simple: The kid pitches regular pitches. If she has a problem with something specific, than you do a drill aimed at fixing the problem. Then, go back to pitching.
E.g., my DD had problems with leaning forward. If during practice she started leaning forward we would do walk throughs with an emphasis on her keeping her right foot up after she released the ball.