I also operated my rescue along similar lines Di.
To be fair though, Pugs rarely hurt each other in an aggressive battle due to their skull and jaw structure. I also stood over them while they ate to ensure those who were being medicated ate thier meds and no-one gobbled thier food with the meds in it.
Still, by and large, they were left to sort out their pack order and their discipline within their little groups without much interference from me. I also felt that interfering usually made it worse and either confused them, or delayed the inevitable of dogs sorting out their issues.