I went from the B17S to the B17 so i could move the saddle back further. I had been feeling sort of like I was riding a unicycle. It helped a lot, but i eventually found that my sitbones were a bit too wide for the B17 anyway, they were too close to the side frame edges of the saddle, so I then switched to the B68 on both my bikes, which was as wide as they come. (I have very wide hips and sitbones to match) It's been heavenly ever since. i ride on the hoods and drops quite a bit and never have any problem with my B68 because of that. I am most comfortable when the saddle nose is tipped ever so slightly up from level.