I was wondering if anyone else has been having this problem with their driver shaft.  I have the 910 D3 8.5 driver with the stock Diamana ahina' 72 X-flex.  I have been hitting this driver for about a month now, and this shaft just feels really weak for an X-flex.  Is it possibly a defect in the shaft? because I did get custom fit for it.  It feels really flimsy.  

Thanks.