I've got a closet full of shafts that I have bought and tried. I finally decided to pick one that I hit fairly well and stick with it. Ended up choosing a Graphite Design Tour AD DI6s. I also liked the Oban Kiyoshi Purple 65. But you have to find one that works for you. Really good shafts are not cheap so go somewhere and hit some on a launch monitor. Dicks sporting goods near my home is always nearly vacant at about 10:30 on a weekday morning and they will usually let me hit balls for free. If you tell them that you are probably going to buy a new driver, they will absolutely allow you to hit balls. Plus, they always have a variety of heads and shafts from which to choose.
Might help; Might not.
JMHO