Unless you are having audible problems, I would not obsess about getting the cables lined up to perfection. Most cables take care of those problems by the way they are designed. It is true having powercords parallel and in close proximity is not good. I solve that to some extent by using zip ties to keep the power cords away from the IC. leaving the interconnects free to wander anywhere.. Where they come close to each other I use water pipe foam cut to short lengths and slipped between the two types of wires. Even one on each, plus a section between, taping the 2 or 3 foam bits together to hold the arrangement. Audio cables can touch and be near each other no problem. Just keep them away (at least a few inches, in general) from powercords. or at right angles to the powercord line. One way would be to add a thin board, or heavy stiff screen, and zip tie the powercords to it behind the rack or a thin board with lots of holes to tie the powercords to it, away from the IC. No need to do the same to the IC at all. Good luck.
