I carry a 50 F, 54 S and a 58 S Vokeys. It was the perfect set up for me in the SM5s.
But for some reason I have struggled with the 58 since they changed the bounce in the SM5 from 7 degrees to 10 degrees in the SM 6 & SM 7 S grinds.
Why the change? - I thought it was best if you had a couple of different bounces in your wedge setup. But now if your an S grind guy, then you're stuck with the same bounce in both wedges. My wedge fitting says I'm an S guy, but I also like a low bounce wedge for tight fairways.