I also cant see all servers (there are over 500 servers), but i can see only 53 of them. And that one i will use isnt listed.
There is a parameter at the multiplayer.json which maybe can fix the problem, i thought:
"Net Flush Threshold":472,
"Net Flush Threshold#":"threshold for auto-accumulation flush while building data chunks (default is standard MTU of 536, minus 64 bytes room for layer headers: 472)",
At my Windows 10, i can use an MTU of 1464 (Net Flush Threshold = 1400 = 1464 - 64).
rFactor changes this value (1400) to 1024, but this doesnt work or help.