Normally play with a 4 5/8 grip with tourna grip. I've been reading that I might want to experiment going with a smaller grip-I think Federer and Nadal play with a 4 3/8 grip with an overgrip. Is going to a smaller grip all about generating racquet speed and wrist snap for extra velocity? Should I go first to 4 1/2 or drop down to 4 3/8 using tourna grip for both. Thanks for your input.