I have a B17 on my Super Tourer and it is slightly angled up because I kept sliding forward.
However I will say I find it very uncomfortable still. I don’t ride it very often so many it’s not broken in yet? I haven’t treated it with proofide yet either most because I’m forgetful but I’ve had it for over 2 years but I’ve only got maybe 400 miles on it. Thinking of ditching it but it looks so wonderful on the bike and matches my Brooks grips.