I'm in the same boat. In the last few days I've rode 50mi on my new b17. I was hoping ride 2 would be better. Lowering the nose to be level definitely helped the perenial pain but the sitbone pain is still there. I have similar measurements to you as far as I can tell (i've sat on playdough so many times but get confused about the results LOL). I'm this close to going back to the saddle which has honestly never give me problems! But I'm also considering trying b68