I demo'ed the Head extreme pro yesterday and my palm is hurting after a couple hits. To be specific it is the area that is connecting to the thumb (not the joint though). I wonder if it is the grip of head racket being less round in shape, and I am holding it too close to the butt of the grip. Anyway, i can still feel it today. How can I prevent something like this in the future? Was it the grip? Or something else?