I'm glad you brought that up. One thing I have noticed about B17s is that they are quite long, and if you are sitting too far forward, your sit bones are not going to be in optimum position. While angling up would not work for my position, I did get quite a comfort improvement when I moved my seat forward by about 1cm on the post. I had it slammed pretty far back originally, now it's in the middle of the adjustment area. Much better and probably about optimum with the 72º seat tube on my Peugeot.