I've been using a Fuji saddle with the cutout center. It's fine up to about 30 mi. and then it causes backache and sore spots. So, I picked up a Selle San Marco Blaze that has a narrow nose and a wider back to fit my dimensions. Although it's exactly what I expected and I kind of like it, after my first ride today I noticed something odd. I have a feeling this is not the saddle, but my left sitz bone is perfectly comfortable (at least during my first 30 mi. ride) but my right sitz bone aches. The saddle is straight, at the right fore and aft position and basically level. Not sure what to try next.