I have a 0 handicap and play AP2 710 irons with Nippon Steel 105 shafts. Was interested in shifting to graphite shafts to pick up a few MPH in club head speed and higher launch. I am 64 years old and hit a 6 iron about 160 yards. I went and hit the 712 irons using the GDI 65i shafts and certainly picked up ball speed and yardage and hit it higher but concerned I might lose control. Any recommendations on a different graphite shaft for me?