One thing you might try when practicing is to change the balls per game to a crazy high number like 8 or 9. There's nothing worse than getting close to developing a tecnique when the game ends. This will give you more game time to practice a shot. Don't worry about your score...focus only on the shot or tecnique you want to work on. After some time, return to 3 balls (or 5) per game and try to hit the shot you've practiced. Rinse and repeat with each new shot or tecnique you want to try.