When I was fitted for my 718 AP1s, they fit me with the AMT white shafts. Since then every set of 718 AP1s I've came across use AMT Red. Since I've been questioned a few times (and do not have an answer why). Would any of you know why a swing warrants AMT True Temper Tour White? I don't remember what the instructor said, but I hit red, wht, and blk that day. And my best numbers were with white. Just curious why white?