I have a 915 F 3 Wood with the Aldila Rogue Black 80 Stiff flex. I really like it and it gives a very nice trajectory to the ball. I have tried Diamana and a few others, but this one suits my swing really well. May be worth a try for you.

If it were me, I would go see a fitter. I have a Black Rogue in my driver and a Rogue M*AX in my 3 metal. I have two 816h1s. One has a Aldila Black Rogue and the other a Fijukura Speeder Tour. I get a fitting on each new club I purchase. It depends on the match up of head and shaft and the results. Titleist has been good enough to provide free Thursday fittings throughout the year.