Hello, I have played more than 160 lobbies and so far I've seen that 80% of them have a problem that is stacking. usually it goes like this:
1 player that has, let's say 5000h joins team red and the one with 600h joins blu, next person with 2000h sees this and immediately joins red and it goes on until the lobby is filled. And at the end blu ofcourse loses.
Even i must admit that i do that. Since i know there were rumors that tf2center will have a anti-stacking method based of of ranks (which i think would be hard to implement) how about you just disable the hours, it won't stop it completly but it won't be as common.