I would go for a fitting and find out the answer to that question. I have always had wedges with the same flex and the rest of my irons until I went to the Vokey event at Pinehurst recently with TT. CD, I am older. I will be 73 years old in September and play XP105 stiff steel shaft in my AP1s and have the wedges thru the AP1 W2. The only other wedge I had was a SM6 56.12 F. When I met with Mr Vokey and Jeremy the very first thing they had me do is try a Regular shaft in the SM7 58.12 D. WOW. What a feeling and difference in performance. Nice to hit the ball in the middle of the club every time. Found out that a lot of pros who might play XS shafts will play S shafts in their wedges. Mr Vokey explained that in Wedges more weight needs to be in the head of the club making it easier to hit. My short game has improved 100%. That is a bold statement, but true. They also gave me a very short adjustment in the sand and my game has completely turned around and so have my scores. Point is go see a professional. My friends are going wow, also. Where has this come from. I plan on getting fit for new irons this year and am sure that my wedges will be regular shafts based on the fitting from the man, himself, Bob Vokey. Cannot thank Jeremy and Mr Vokey enough for opening my eyes.

Yeah, that would be the way to go, plus it would be a nice field trip to MA. My SM 4's were full custom featured, and I never thought the shafts would become too stiff.

I have given up on my Vokey Custom SM4 wedges except for shots of 40 yds or less. It is ok, I am getting less distance every year. It is a joy just to be on a golf course, even a par 3 course.

Unless you picked a custom shaft for your SM4's, then they would be DG S200's. So if you are playing R flex in your irons then the wedges would have stiffer shafts.

As Chuck said above, it may help to have a little more flex in your wedges compared to the flex in your irons.

Right if you are playing stiff irons, might be best to be playing regular irons. But would recommend a fitting by a certified fitter not by us. They can you the correct irons and shafts that fit your particular game. Worth the time, money and effort. Those clubs will last you longer and your game will be more fun. With respect. Any new set normally take a few months to break in.