azgreg I've always had to build my son's drivers with steel shafts. Anything graphite is like a pretzel in his hands. For his current driver I used a Bi-Matrix shaft, and it is working well now for the past couple years.
Did you add any head weight? Seems that thing would feel so out of balance, in my hands anyway. I know the head is light, I still have 1 left. (repainted charcoal, so I could sell to Spuzz)