My sitbones are 130mm center-to-center (not sure if your measurement is outside or center), and I had a major, chronic saddle sore and very sore "inner bones" (don't know the proper name, but they are NOT the sitbones, but bones farther in on the pelvis) from, I now know, riding a too-narrow saddle where my sitbones were perched too close to the edges (~140mm). I am now on a Terry Butterfly (160mm, I think) and doing great. I'd definitely recommend you stick with the 155 mm Specialized saddles or something in that width range rather than going much lower.

Good luck!