His driver swing speed (using my old Ping G400 Max) is between 90-92. The last few days he has hit balls with several regular flex shafts - AP2s with ProjectX5.5 steel shafts, M4s w Fujikara Atmos Red 6 graphite and JPX 921 Hot Metal with UST Recoil ESX F3 graphite. He definitely prefers the weight of the graphite shafts, although on the swing machine the spin and angle of descent aren't perfect with a 7i. Wondering if something w softer tip will help. Might make another trip to the Superstore
I've discussed with his instructor before, but now that I feel like I'm narrowing choices, I'm going to bring it up again and see what his feedback is.
Thanks for adding your thoughts!