My fitter was world class. He explained to me that he left coaching for professional fitting because he saw too often talented golfers with high club head speed hitting the ball very short. My driver was a standard flex club, which I learned is designed for golfers with a swing speed of approximately 80 mph. My swing speed was well over a 100mph. We tried 8 different shafts and found 5 different club heads. The result was my back spin was lowered from an average of 6000 rpm to 3000 rpm for my driver. I learned that the saying, "its the golfer , not the clubs" is not entirely true. I walked into the fitting session hitting 220 with my driver and left hitting 270 with the custom driver fitted for me. I expect to be hitting 300 within the next 2 years.