OP,
Your rig seems excellent, not sure I see much there.....especially since you updated us on your power updates. I do have two recommendations if you have not done them:
(1) Use high quality power receptacles. These made more of a difference than any power cable upgrade I made, and I have thoroughly tested a bunch and can recommend three: Furutech GTX-D(G) gold, Furutech GTX-D(R) rhodium, and Oyaide R1 (Not the SWX-??? series). The Furutech rhodium is more revealing and forward of neutral, while the gold is more laid back and warm of neutral.
(2) Look at GIK Acoustics for room treatment. They have really attractive diffusers and absorption panels, that will fit most rooms....and in my case, meet my wife's approval. Mike Major was a great help, and helped with free with using their free analyzing software and design.