A new ball is not going to equate into higher scores. The only things that improve scores is correct practice. You should be hitting your mark +/- one board over 90% minimum. IMO a premium ball could be causing more harm than good at this point for you.
Get some coaching, books, look for seminars to attend. Most seminars around here are Friday, Saturday and Sunday. Some will video your game before, and after to show you the improvement in your game.
Practice, sub in a different league. Put time into fundamentals like approach, swing plane, fee arm swing, etc. You may think the ball is the key to better scores, but it is practice, practice and more practice.
You can buy a gi and black belt, but that doesn't make you an expert in martial arts.