Wow, this discussion went sideways really fast!! so, based on this:
I was hoping to get some feedback on improving the musical delivery, basically more refined sound
I really think you do need to replace your Adcom amp. I used to run these amps a long time ago. While they were the "good for the money" amp and sounded nicer than the normal consumer electronics crap, they really are not that great. Especially when you are pairing them with the Anthem AVM and the Revel M126Be (which is an excellent choice in my opinion). The old Adcom amps were nice, but they were a bit warmer sounding and did not have good resolution at all. Basically, the sound was a mess and you would not get good "separation of instruments" at all.
The new Anthem amps are not bad, but I think you can do better because they are not as engaging as other amps. The Pass Labs amps are very nice, but they do have a unique sound. Very smooth with excellent resolution, but have more of a "controlled" type of sound (i.e. they are not as dynamic as other amps). If you like this type of sound, then great. The "XA" Pass Labs models are "full Class A" and are even warmer and slower sounding. Many love the sound of Pass Labs. I would say if you wanted to keep the "type of sound" that you had with Adcom, but with much more resolution and refinement, Pass Labs is likely a good choice.
On the other hand, if you want a more revealing and transparent amp with a lot of dynamics, then I would recommend looking for a Luxman. Maybe try to find a used Luxman M-700u amp. There is a M-900u from The Music Room for $10.4k. I don't know your budget. Or you can go for a Luxman integrated for about $5-6k.
There are a lot of Luxman products on ebay that are shipping from Japan. I would be cautious of these because they are almost all wired for 100V AC (Japan's standard) and will not work well with the 120V US standard.