I've used kbs tour in stiff shafts for years but at my recent fitting I was matched with Nippon modus tour 120 in xtra stiff. Just curious if this shaft is a little softer flexing and that's why or if this may be a mistake? My 7 iron swing speed was 90-92 mph, I tend to hit the ball high with fairly good spin rates. With Nippon x shaft computer stated 170-174 carry with 6,500-6,800 peak height 90-95 ft, verse kbs stiff 170-174 carry with 6,900-7,200 peak height 106-110. Based on a computer it's sounds ok but not sure if x is too much for me based on swing speed. I guess I'm nervous to switch to x at 40 years old after playing s400 than kbs tour S for a while. Any recommendations or thoughts?