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I haven't rotated them and what I've found is that the larger shoulders fit better lower (more surface area) and the lower level being closer to the fire cooks a little warmer and the smaller shoulders left up top cook to perfection where the temp is a little lower (this is where the guru probe is and I set the temp to 210)
upper shoulders are about 7 lbs, the lower ones are about 9 lbs each.
I simply love cooking these in the large- so efficient, so little fuel used
the BGE amazes me every time I fire it up and the CGS has expanded the BGE's capabilities!
Hope yours turns out as good as these ones did