I have noticed when I do my 1st serve, somehow on contact/just before contact my grip is turning slightly towards the semi-eastern area. I know this is a bad habit and it should be fixed. Any suggestions on what causes the sudden change of grip? and how do I fix it? I am using a #3 grip + an over grip. It should be OK for my size. I am holding the stick with the butt cap about 1.5" down from the center of the palm.