Don't sell short the benefit of a holistic cabling scheme, including power cords. You might appreciate the affordable line of Iconoclast Cables. I reviewed their top line for Dagogo.com, but the design/geometry follows through the three tiers of Iconoclast Cables.
All links in an audio system are weak links potentially. The weakness is shown when the link is upgraded. The amount of upgrading is nearly infinite. You select how far you wish to take it. There are dozens of levels of significant improvement to be achieved in an audio system if so desired, many for each link, limited only by one's vision and resources.
The stands you built are an excellent enhancement to the Quad speaker, addressing a fundamental shortcoming, that being too low to the ground. You have achieved an effect similar to my Landscape Orientation method, seen in the image of the PureAudioProject Trio15 10" Coaxial Speakers in my virtual system. :)