i have a theory about this that im starting to try out. i play a 9.5 510tp right now and hit it good i too used some impact tape and noticed i was hitting it higher on the face than i thought. I lowered my tee and hit some drives that the tape showed where dead center they where definately hotter but the trajectory was to low. after seeing the video of ernie els hitting his driver more near the top of the face, i measured the loft on my driver at the center a half inch towards the bottom and a half inch towards the top the lofts were center app. 9.5 bottom app. 7 top app. 12 degrees . maybe thats why tiger tees the ball so low because he knows he can hit the center of the face and get more ball speed. at the tavistock cup the showed ball speeds of tiger 174 ernie 168 sergio 163 and omeara 157. so the vertical roll of the driver changes the loft depending on where you hit it this is not a revelation. but the roll is not needed, tom wishon makes some drivers that have very minimal roll so you have a mopre consistent trajectory im guessing if i hit a 10.5 in the center on one of his drivers i might even get a lower loft than hitting mine near the top. there is a member here who is a clubmaker and sells wishon products
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