Jim, I actually did it through club fitting. Most would never believe that someone with those types of distances would use a 10 degree driver. The loft and flex of the shaft can have a HUGE effect on distance. It was funny when I was placed on another manufacturers' launch monitor. He said, "your launch angle is perfect! Have you done this before?" I told him that I had done it by using a fitting cart and finding the trajectory that I liked.
Most of those that I find using 8 degree drivers are trying to get the trajectory down with equipment instead of swing mechanics. (Trying to buy trajectory, instead of understanding lag pressure.)