Ethernet cables

I started something that I really regret now! I changed my Melco ethernet cable (from switch to streamer) to a very expensive Audioquest Vodka and hated the sound! I returned it and got a similarly priced Atlas Mavros cable which I also hated. Both stripped the life out of the music and while they were very smooth and detailed, they never really got off from sounding dull.
Then just for fun (!) i tried a cheap Cat5e cable that i had in the garage and actually preferred that to all of them, including Melco. 
Anyone had any similar experiences?

The Swagman is powering an iFi reclocker. I use it between my Node2i and Audio Note Dac. 

I've heard the term RF sniffer used, but it's actually a device for detecting hidden cameras and bugs. It works really well, my friend used it and found RFI hotspots. 
I feel lucky that the RF stops at my router and computer and doesn't travel through the ethernet to the system.

Very interesting responses so far! I tried using a high qualirty mains block on my router rather than the cheap one I was using and immediately heard the difference. So and LPS may be the way to go. 
It's just a standard BT router, so now the question is whether to go for a better router first or use this router and upgrade the power supply. 
Any thoughts?
I was going to upgrade the router to a LPS as discussed above, but I just installed a  Brickwall surge/conditioner on the router. The result is an outstanding reduction of noise. It's almost like a component upgrade; faster attack, more defined leading edge of notes, recordings have more air and space.

Routers are full of noise which is passed on to your audio, I had no idea how much. I think this is will be my solution.

I tried various CAT5-7 generics before settling on Supra CAT8.  The big moves are with an Ethernet switch between your router and the endpoint, such as SOtM or an Uptone EtherRegen.  Consider an EtherRegen between your router and the Melco.  EtherRegen sounds fine with the stock SMPS, but can be further improved with something as easy as a Zerozone 9V LPS.
My plan was to use Supra cat 8 from panel, to router, to all equipment.  I purchased one terminated cable, then made the mistake of buying the Supra roll of cable and their rj45 connectors, figuring i would do the rest myself. I have since learned that the grounding on the cable can introduce hum in the line if not done properly. 

I've set the cable aside and will use my cat6 I have on hand. How are you guys terminating the ends of the Supra cables? So many different opinions on this, regarding "acting like an antenna" and a bunch of other stuff. I would hate to get the exact issue I'm trying to avoid by installing the cat8.