What Jim says about Tour Issue heads being different is correct. I have a Tour issue R7 TP and have compared it against the Retail R7 TP and they don't perform the same. The Tour Issue version is much more solid and they have done something to the COG to bring the ball flight down and reduce spin rates. I also understand that better high grade Titanium is used in making the Tour Issue versions. They are designed for players with high club head speed which Yoda has . The retail verions are designed around the needs of Mr Throwaway hacker. If the Nike you used was Tour Issue this will be a lot different compared to the retail version. So if you are going to get one get one from your tour contact. I have my clubs fitted by these guys
www.precisiongolf.co.uk . They are very good. I am a high spin player and they said I should stay away from the new super big headed drivers as they would not suit me and bring my already high spin rates up.