Sounds like you may be "pressing" a bit. Relax, and pry the ball off your hand, and enjoy the game. Simplify things by starting with the line to the pocket that you know you'll find good reaction, and, once again, RELAX.
Your best scores probably happened when you weren't trying to score big, but got into a "relaxed focus" and things just fell into place. Internal pressure (because you want to do well) can be good or bad, but it needs to be controlled. Slow your heart rate, and find that "happy place" before you pick up your next ball.
Top performers realize that the mental side of any physical endeavor is every bit as important as the physical, because it allows the physical to perform unencumbered.
We've all been there, too. Good luck as you move forward.
