@grm,
Before you spend $$$ on a high end Ethernet cable, I suggest you try the Supra CAT 8 cable. If you hear audible improvements over your existing cable then you can step up to Purist or SoTM CAT 8 cables.
https://www.ebay.com/itm/Supra-CAT-8-STP-patch-cable-1-meter-Made-In-Sweden-THE-BEST-FOR-NETWORK-AUD...
IME, Supra is quite an amazing cable for the money.
Before you spend $$$ on a high end Ethernet cable, I suggest you try the Supra CAT 8 cable. If you hear audible improvements over your existing cable then you can step up to Purist or SoTM CAT 8 cables.
https://www.ebay.com/itm/Supra-CAT-8-STP-patch-cable-1-meter-Made-In-Sweden-THE-BEST-FOR-NETWORK-AUD...
IME, Supra is quite an amazing cable for the money.