Maybe try experiment with a slight span/pitch adjustment.  I would at least go talk to your proshop guy to see how he maybe tweaked someone's shot or span in the past.

I only say this cause i have been working on a new release my self, and found about a 3/8" stretch and a thumb pitch adjustment to be very helpful in throwing the new release without overstressing my hand/wrist.

I think one thing people fail to realize is our hands change over time.  (gain or lose flexibility, increased or decreased tilt, etc...)  You can have the best pro shop guy in the world, but if you don't get your hand re-sized every once in a while, your amazing fit from 2 years ago won't be so amazing.

Make sure the fit you have is the best fit for you NOW.  Have your driller start you over from scratch every year or two to make sure you are ahead of the curve when it comes to your fit.

This may not be the specific issue with your situation, but starting from the beginning is a good place to start.