In the past I have had very good luck with the FST115 Pro iron shafts.  Getting older (76) and would like to try a lighter shaft but don’t want to go to graphite… don’t like the lack of feedback from graphite.  I know the stepless FST line plays a little softer than flex but would the FST90 play similar or a little firmer than the FST115 Pro?  (I don’t know if I should trim the 90 to R or soft step to match the Pro).  Thanks in advance for your great knowledgeable suggestions and advice!