I'll get right to the point...last year I purchased the 910D2 and was fitted for a 65g Diamana Kai'li S-Flex.  My swing speed average with the driver is roughly 110-115.  I hit it well last year (well over 300 when hit consistently) so I figured I would pick up the 910F (fitted for the Project X 8-C4 82g) and the 910H (Ahina 90  91g S-Flex).  The problem now is that I cant control my driver for a lick...while my heavier shafted 910F (roughly 300 yds with roll on launch monitor consistently) and 910H fly great...the driver is another story.  Im about a 7 handicap and typically draw the ball, but recently my driver has been costing me strokes left and right.  I would assume I  need a new shaft on the 910D.  Any opinions would be much appreciated, especially any possible shaft recommendations from someone who knows a ton about shafts or a Titleist concierge given the ones I listed above. 

In the mean time I'll be busy practicing the Bubba hook from the woods..

CS in PA