Fellow golfers, as I've aged to 73, my swing speed (65-70) and strength have diminished considerably. I would like to replace the steel shafts in my SM5 and SM6 wedges with graphite. Recommendations? I'm blessed with the 48, 52, 54, 56, 58 (I couldn't choose which I liked best!). Instead of replacing with graphite, does it make more sense to just buy a few SM8s with graphite shafts? Thanks for your input.