Are all the butt cap sizes at the end of the racket the same size regardless of grip size? I used to played with 4 3/8" but switched to 4 1/2" grip size. After the switched, I noticed that my palm is getting a lot of friction from the butt cap. I don't believed I changed my grip style or how low I grip the racket handle. It is always been at the very bottom. If there is a size difference, the local pro shop should be able to change it for me from 4 1/2 to 4 3/8?