I'm going to add one more notion here even though I'm late to the party, just because something rings a bell (to use a bad analogy).
That turning up the volume you mentioned above, Matt--to get something fuller and richer--is probably all done with now that you have a new amp. But nobody mentioned what is usually the reason for it, in my limited experience. That is lack of detail. Until I got quality electronics myself, I was always listening loud because definition seemed just out of reach. Things would fade in and out of focus in subjective milliseconds.
You have pretty good electronics now, but the source is where detail starts and nothing downstream can add it. You might take a look at your CDP to see how much more detail you can get out of it. That was maybe the biggest difference I noted between my Shanling CD-S100 (same as the MMF CD-25) and the next step up (the CD-S100 Mk II in my case). Before I made that upgrade, though, a good power cord on the S100 gave me an extra slice of information that was very welcome.
I could have continued the upgrade path with the player, modding clock and op amps, but I chose to move up the line instead.
Your system looks very nice to me. If there is any imbalance I think it is upstream, at the source.