These results not surprising, unique results with unique setups. I bet you'd do better with the Acoustic Network ethernet cables, this based on other's reviews of them. I've also experienced the benefits of better ethernet cables, having gone from generic through Supra, Wireworld and various Audioquest, finally settled on AQ Vodka as best in my setup. While ethernet cables may not have provided greatest benefit, they are still worthwhile investment.
I'll still maintain the most beneficial network improvements come post server, which means two computer setup, aka separate server feeding usb renderer/roon endpoint/streamer.