ok, i have the callaway bb II 9* driver with the stock firm flex shaft. i've had it for almost two years and since i'm more serious about my game now i'm thinking about putting a new shaft on it. with the stock shaft, i don't get a penatrating ball flight but a bit balloony with not much run out. anyone have any experience with this driver and different shaft? what were the before and after characteristics. please share. thanks.