I understand that you can only have one of each map/6'sorHL. But we need more restrictions. I don't have a screen cap but just this weekend I saw well over a dozen HL's open because no one wanted to play med, heavy or engineer and then no one started. (Or atleast it took a long while)
I suggest maybe 2 per EU OR NA OR AU which is then 2 6's or HL.
I know it means some people will play what they don't want but I've been in a situation where I spent a day playing medic game after game because all I had to do was open up center and see 4-5 lobbies only needing medic.