I was fit for my 910D2 two years ago and am concerned that it may be time for a shaft change.  At the time I was fit for the Kai Li R flex but was right on the border between R and S with a 96mph swing speed.  I hit both the R and S flexes and chose the R flex due to my average loading at the transition (at the time).  Now, I'm concerned the shaft feels to light and whippy and I can't go after the ball like I want to as a result.  I have really been struggling with timing and it seems I loose the feel of the clubhead and shaft when loading (now more aggressively).  What are other clues that it may be time to go in for a refit?  

Thanks,

GW