The end goal of scrim should never be to fill the slots... There's a reason why it's locked. Scrim's main purpose should be to give SG players a place to participate in 5v5 matches. Whether or not the games are quality should not matter to anyone at the end of the day.
If someone can convincingly provide the argument that scrim is being filled with randoms trolling, the password should be changed. If it's just bad players constantly filling the server, then there isn't a serious need for it to be changed. Get your friends that are good and convince them to play scrim.
If you're focusing on the rank of Scrim when compared to our other servers and managing it based on that... you're doing it wrong.