you are stating that differences between LAN cables have "repeatedly (been) proven, also with measurements...".
I am wondering where those measurements actually could be found. This topic is a discussion in many HiFi- forums and there are always people who "believe" in those differences and those who don´t and who challenge the believers for actual proof and not only differences detected while listening to different setups.
It would be a great help for the "believers" if you could supply us with the sources/links.
Cheers!