I could fix this problem... Much easier.
Give all DLC maps included in the downloadable version, Also make them free on the store, no excuse not to own them and delete the toggle we all clamoured for.
There, bigger player pool and quit messing with the map packs. Make the new DLC maps higher weighted and stop messing with it, if people want to play Plaza and stuff go and play Uncharted 2.
No more issues since ND can't touch it and we get a better pool of players.