1. My CLX Anniversaries came with pretty heavy trick expensive looking power cords. They sound wonderful to my ears. What I say is substitute them with regular 12 gauge and see if you hear any deterioration.
2. OP says he substituted the trick cords and listened. But the big capacitors in the speakers will have stored the 'low quality electricity' and it will last a while before being replaced with the 'high quality' stuff. So if he heard an improvement immediately, he was still listening with electricity from the regular wire. Must have been expectation bias.
3. There is no scientific evidence that power cords can change the nature of electricity.