I just swapped out a B17 for a B68 on the All Rounder, set up with Albatross bars, flipped. The B17 was new out of the box last January, and although I've put several hundred miles on it and been generous with Proofide, etc, it's been reluctant to break in. I have two others in rotation now, so I'm familiar with the concept...
Meanwhile, I'm still tweaking the height and fore/aft placement of the B68, but so far it has been pretty comfy...I picked it up used, off this list...not sure how many miles it had been ridden previously, but it appears to be pretty new. I'd recommend giving one a try.