New saddle, now back hurts
In the ongoing effort to find a comfortable saddle, I switched to a Specialized body geomety saddle. Before that, I had a Trek model. The new one is a little firmer, and noticably narrower. (Changed the size on the advice of a tech who "fitted" me at the LBS). So now, I am experiencing lower back pain about 10 miles into a ride. Gets really uncomfortable by 25 miles. I did not have any lower back pain whatsoever before this saddle. As far as I can tell, the height is correct, with very slight knee bend with leg at the 6 o'clock position. Front to back feels right.
Could this new problem be due to wrong saddle size or saddle too low or high? I'm about ready to switch back to the old Trek saddle and put up with the butt pain. I am doing a 192-mile weekend in a little over two weeks, so any suggestions would be appreciated. I'm sure I can complete the 192-miles on the old saddle, but my butt will not be happy at all. Big time discomfort sets in about 50-60 miles, then I just have to work through it. Or maybe this is normal?