Chris I'm trying to get my head wrapped around the BD sizing. From Surly's website the effective TT on a 54cm CC is 22" and the the effective TT on a 20" BD is 24.2" I'm surprised the reach is less on your BD than it is on your CC.
I was confused on the sizing as well. I'm more of a Road bike person, so Mountain bike sizing just confuses me in general.
I wasn't expecting it to work out that well, I thought for sure I would be using Trekking bars.
The stem and bars are the same ones that were on the CC before I moved them over. One factor to consider is that I'm using a Brooks saddle, which has lots of wiggle room on the rails. I bet if I put the bikes side by side the saddle on the Big Dummy would be moved up quite a bit while the Cross Check saddle would be pushed most of the way back on the rails. I'll check that when I get home tomorrow.