There should always be a purpose to your practice. What have you and your coach identified as a form focus? Can you achieve it? Can you repeat it? Then, can you feel when you get there? Let me explain in more detail.
Let’s say you and your coach have identified you need a better line to your shot. You go to the range with the idea of improving your line. Can you identify you are in a better position? Has the line improved in a measurable way? Can you now repeat the position? Finally, can you feel the difference between the old line and the new line?
This form change should be the sole focus of the practice. Any change in form will likely lead to a degradation in score. In fact, scoring while working on a form element can be counterproductive. The purpose of the practice was to achieve a better line. Did you get a better line? If the answer is yes, can you say it is now a consistent part of your form? I’m guessing it will take more than one practice to say yes to that question.
An improved score is often the last indicator that your form change has been successful. Continue to get feedback from your coach and practice with a purpose.