I have been playing my AP1 712 irons for 3 years…stiff steel shafts….I've noticed the past few months that my left elbow and left hip have been very sore after a round…thinking about making the change to graphite shafts…I'm 58 and average 8-10 rounds a month….anyone had this type of experience resulting in a shaft change? Will stay with the AP1 but move up to the 714.