Recently I have been going through some swing changes with my coach and have only been working with my irons. As the lessons progressed I started to find that I was finding my irons to feel heavy in my hands. I tried out a couple other types of irons and found them to be easier to swing, they felt lighter. For the first time since I bought the irons I thought maybe it was time for a change. When starting to look in to new irons I realised that my AP1 irons had true temper dynamic gold s300 shafts in them. When asking the club fitters about this they said that most had SL300 and the new ones have XP95s. this is quite a change in the weight of the shaft. Is this the heavy feeling im feeling (especially in my long irons, I know the clubs get lighter as they get lower but this is just what im finding)? Is there a big difference in club head weight from AP1 to AP2 or even CB to MB ? would just changing the shafts in my clubs make the difference?