Nice one, Oliver - looks good, and I'm glad you can hear a genuine difference!
For me, using mains leads that are properly designed for hi-fi purposes, such as you've now built, is simply a case of 'good housekeeping', in the same way as we don't use the 'freebie' interconnects that sometimes come supplied with gear, or no longer hook up our speakers with bell wire, as there are clearly better alternatives available.
And the same applies with mains cables, proving that you *can* do better than use cheap 'kettle leads'. I've really no idea why some folk struggle so much with that concept - certainly those who are clearly capable of trusting their ears and making subjective decisions elsewhere in their system
Anyway mate, ignore the naysayers, trust your OWN ears and senses (always over ALL else), and enjoy the music!
Marco.