@mlundy57 -- thanks for the detailed response here, definitely something to consider.
I'm back to the original setup, which sounds quite a bit better to my ears to the two alternatives (rack in middle, and all gear to side).
1. Sold the BPT 2.5 PC, and am back to just the P.I. Audio MiniBuss.
2. Amp is now in the center between the speakers, with my better supra ply speaker cables (short runs connecting the co-axial drivers).
3. Turntable and phono preamp is still on my side rack, since that is the only way I can play records without it skipping. I may still consider the wall mount and sell the rack.
4. DAC is behind the right sub amp connected to my mac for digital audio playback. DAC is now on cutting board.
I still have to do some cable organization work to try and keep some of the power cables away from the signal cables. And I have to get another TWL digital american PC for my DAC, although I have been considering the OPPO sonica DAC, since I can put all my FLAC files on a 1TB drive plugged into the OPPO and not have to deal with the long S/PDIF cable and USB to S/PDIF convertor out of my Mac. It also opens me up for high res playback.
The only compromise I can see right now is needing to run 22' RCAs from my phono preamp to my amp. But its a RG6U solid copper double-shielded cable and I can seem to hear any additional noise vs. the shorter BJC I was previously using.
I also played with carefully placing the speakers and toeing them in so they are firing exactly at the same angle behind my head. I've moved the speakers in about 3" and toed them out by a few degrees. I also moved them out into the room another 2" or so. I'm now at 83% width center to center vs. speaker to listening position. \
Here is the turntable and phono preamp.