I currently have the 710 AP1 irons 4-P in my bag. I love them and I like how they feel and sound when i get good hits. I've been playing for 2 years now (1 with the AP1s) and as I play around with different players they comment that I have great club heads but not great shafts ( Nippon NS Pro 105T for Titleist- Stiff) . I want to make to make a transition from playing a high launch shots to more lower angels. I have been looking at the project X 6.0 shafts and wondering if it would be worth the upgrade on my AP1s and if it would be too hard of a transition? Also, I'm want to know how much it would cost for Titleist to make do the change or if it would be cheaper elsewhere...