For the Brooks B17 Imperial, does anyone know exactly which zones are different between a normal, narrow, and S?
I know that the narrow is "narrow", and the S is shorter.
But for the narrow, is the general shape of the sit area similar to the normal? Is the middle and nose also narrower or the same as on the normal?
For the S, is it only the nose that is shorter, or also the sit area that is shorter?
Would the narrow and S have the same "hammock" profile or more flat?

I had a B17 flyer for 8 years for touring, but the middle-nose sometimes gave me pain in the forward perennial. After maybe 3 hours it would become annoying. Tilting down and the pain goes away but I start to slip forward. I eventually made a cutout and most of the pain went away, but it's since stretched too much now, and into a banana shape. The curved shape rose the nose and the forward perennial pain started again.

So I bought a B17 Flyer Imperial, but I have a similar again with pain in the forward perennial, usually after 1 hour. Tilting down makes me slip forward. I was theorizing maybe the springs causes too much change in nose elevation when riding, causing changes in pressure around the perennial.

So I was thinking to switch to a B17 Imperial without springs would keep the nose height stable and controlled. I have since gotten a seatpost suspension, so springs would be somewhat redundant. But I prefer a less hammock or banana shape, so was wondering how different are the shapes (curvature) of the narrow and S. Does anyone have experience riding the different sizes and can explain how they feel? Thanks