I recently purchased a new set of Irons for the 2018 Season. I had used my previous set for about 10 years and hit them really well. When I purchased my new set this year I ordered with all of the same loft/lie/Length specs as I had in my previous set. The only thing different was the shafts that I got in the new set. My first time out with the clubs I noticed that I was striking each iron shot on the inside of the club face near the heel. I had never really had any issue with that before with my old clubs. I figured maybe I was just swinging different or needed to get used the new clubs. After playing with them all summer I am still striking almost every iron shot on the heel side of the face. Not sure if Shaft, Flex, Swing Weight would have anything to do with this?