I wanted to see if I can get a recommendation on shaft combination with my or new AP2s.  

I'm a 4 handicap and play the 712 AP2s with the Nippon NS Pro 970 shaft stiff flex.  My swing speed with a six iron is around 78 - 80 mph and my driver is around 96 - 98 mph.  I like the way the these launch but tend to hit them a tiny bit fat and I believe this is partly due to the weight and flex of the club.  For example I recently demoed the cally Apex iron and think the best shaft there for me is the Project X 95 flighted 6.0 flex.  I found with the 5.5 I hat that club on the fat side.

Any suggestions / comments on the what could be a better combination for me with my Titleist irons?  I really like the way they look and feel.

Thanks