I just got a 14" WSM, and tried it this weekend for the first time.
I did 2 racks of baby back ribs. To test the process, I cut one rack and split it between racks, and rolled the second rack. The cut ribs were excellent. The top rack was probably a little better, and got a little darker, but both were excellent. The rolled rack on the top was a little more dry than the flat racks. I didn't flip them half way or anything. It could be a fluke. But do you do anything differently when you roll ribs?