Up until 3 weeks ago, from the start of the second half of my Thursday night league I couldn't get my average.  I was shooting anywhere between 550 and 590.  I knew something was wrong, but I just couldn't figure it out.  The ball just didn't feel right coming off of my hand and when I did happen to hit the pocket I could not carry at all.  So I was practicing one day and another guy that bowls in my league let me throw some of his equipment.  Our span and finger hole sizes are the same but he has a little less reverse pitch in his thumb.  I realized that his ball felt better coming off of my hand then my own equipment.  When I went back to throwing my equipment it felt like I was losing the ball at the bottom of my swing although I feel that my grip fits like a glove.  So I contemplated with reducing the reverse pitch in my ball, and then I thought how bout if I put a few pieces of tape in my balls.  It is amazing what 3 pieces of black tape can do for your fit.  I have never really used tape much, but since I have made that adjustment I have been back on my game and will always have a box of tape with me.  The past three weeks although not amazing have been fun again and I have shot 605, 645, and 647.  Now I need to get out to the lanes and start working on that ten pin again.