Hi Jade
Not surprised about your cabling & AC cost % compared to total system: I'm somewhat just under the 40% figure myself. I couldn't agree more that this is a major part of what makes or breaks a really great rig.
Agree with Oz that your attention to detail certainly approaches the fanatical; the isolation & vibration tweaks again make all the difference, assuming that the hardware is initially capable, then these "little things" all add up to show off its' true character.
BTW: I just ordered those special brass pucks for the OB titanium cones from Stewart, along with Zoethecus Z Slab shelf which he suggested to try in place of present Black Diamond shelving; this will certanly be an interesting experiment. Thanks again for all your help & suggestions which have helped to realize dramatic improvements from such seemingly insignificant & easy-to-implement tweaks.