Rather than worrying about where the SteamVR settings file is being stored and potentially giving outdated information, just us the dev console
For more info: https://www.reddit.com/r/Vive/comments/8dv6wx/til_steamvr_has_a_web_ui/
Just a reminder, SteamVR needs to be running before you try to connect and it will become unresponsive if SteamVR is closed. However, if you use the extremely useful “restart” command it will restart SteamVR without closing the console and is much faster than manually restarting SteamVR (ie closing the window, wait, reopen SteamVR, wait more). It is useful when trying to fine-tune settings (ie changing SS for a new game).