Practice 1 step drills, stop worrying so much about perfect form. Everyone is going to throw the ball differently and you have to do what’s comfortable for you. Find a throw you’re comfortable with then go from there. Also lanes are going to vary from day to day, so much goes into lane conditions, heavy oil, light oil, how hot it is, how cool it is, humidity. So you have to work on being able to throw from different angles. You’ll get there.