I currently have a 910 D2 10.5 driver with the Project X Tour Issue 7D3 shaft, which is a 5.5 flex. I am now looking to purchase the 910F but the lowest flex Project X shaft is the 8C4, which is a 6.0 flex and a bit too stiff for my liking. Is there any plans to add the Project X 8D4 to the lineup? If not what shaft should I be trying that would have the same characteristics as the Project X in a 5.5?