What Server and where are you located? What times do you play? I am guessing part of your challenge has to do with the time you play and the server you are on.
I have several alts at varying levels and there are plenty of people on to group with and QH always seems to have a lot of people in it. In fact on my level 34 Dirge I had to turn on my Auto deny group invites because I got tired of turning them down when I couldn't group.