I had the same appreciation you have and it was confirmed by a tour pro. I got fitted with a Fujikura Speeder 757 X stiff and the difference between it and the stock fujikura was amazing. My new question is i got the DG S300 on my irons but they are stock.... But are the DG S300 Stock different from aftermarket DG S300? I hit them pretty well but some times the ball just goes straight to the right (not slice just stright out there).