I would echo @jazzman7 as I had a similar experience when I also started with an English Electric 8 switch. My experience with it was positive though the impact in my system at the time was less pronounced.
I’ve since upgraded most elements of that system and recently installed a Reiki super switch with an outboard LPS and its effect was immediate and far more beneficial. A very worthwhile audition for anyone considering their digital hygiene.
I also have a Network Acoustics Eno filter and I would say its impact is positive but nowhere near as significant. I may try going upstream there, too, with the Muon pro, but am satisfied with my results for now.
Similar to above, I have fiber coming into the house but use a Netgear Orbi mesh router. I have the Reiki switch out of the port of a node in the mesh, followed by the Eno filter into the streamer. I am using the Ethernet cable from Network Acoustics from the filter to streamer as it came as a system.
I haven’t heard the Melco but understand it’s very good. I had previously auditioned the Nordost Qnet switch and LPS. For me, the Reiki as a significant step up over the similarly priced Nordost unit. I also seriously considered the similarly priced Network Acoustics Tempus switch but liked the Reiki approach and was able to purchase from a dealer because we hobbyists need them.
My conclusion is the switch is more important than the filter though i can imagine others may feel differently. I would also note that while the English electric 8 switch is modestly priced in comparison, I would consider the Reiki the better value based on the results.
I can’t speak to the impact of the Ethernet cables.
Best,