[Hell-met]

Have you considered setting up an exact copy of your Valve Maps no mods no bs server with an automatic redirect? Hear me out, it may or may not be a good idea.

Set 1 slot to never be playable, then when people see an empty slot they join the server to be reconnected to the alternate server. Its a little subversive and might discourage a few people but after time people will add both servers to their favorites.

Just an idea.

--edit--

Once the alt server is up and running and as popular as your other servers the locked slot could be done away with.

I'm not sure about this, it would separate the regulars imo.