Glad to hear you liked this! The first version I tested had the mono drums/bass/keys reduction static in the center speaker during that section, just like on the 2014 5.1 mix. As you know that part audibly 'walked' from the center to the left speaker in the old stereo version, so I suggested that he try some movement there - as a sort of homage to the original sound - and it worked out really nice.
Maybe the shakers in the front height speakers during "Your Move" (as noted upthread)? Some of those quick guitar fills in the tops throughout "Yours Is No Disgrace" also seem more pronounced than in prior versions.
In terms of the spatial positioning, the Atmos mix is definitely more faithful to the original stereo than the 5.1 (guitar and organ left/right pans are restored) - yet there are also some moving elements that were previously static, like the distorted bass(?) during "Wurm."
I had to chuckle when reading a review over at SHF where someone complained about Kaye's organ in YIND being 'way off to the side, cut off from the band' - as if it wasn't always that way in the original stereo mix