I'm kinda wondering how far one should go with the shafts you use on your set of golf clubs. I just bought a set of Srixon z585 irons (5i-PW) with the Miyazaki Kaula 8 graphite shafts. My Driver and 3 wood have Mitsubishi Kuro Kage Silver TiNi 70. My two hybrids are Cobra #2 & 3 with Aldila Rogue Pro shafts. The shafts are all stiff flex. Now my question is am I hurting myself with this different mix of graphite shafts or it really doesn't matter. My knowledge in these matters in next to nil, hence my asking.