Wattgate/Lacey Power cord on the amp, would be my suggestion. The CDP does not use very much power and I have not been able to hear as much difference on my CDP as I do with the amp. I did find that the power supply made the biggest difference. I took the power cord from my Richard Gray and put that on my CDP, when I got the Wattgate/Lacey power cord. This gave me a 3D soundstage. I was not getting that with factory cords.
Try a lot of stuff, some things make a big difference and som make very little. Hospital grade, if you try to make your oun stuff.