Maybe it's just because I'm on Aether, but when the 1 - 49 dungeon shows up in the Wonderous Tails I usually choose Haukke because I like the aesthetic of it and it's an easy run and I usually have no trouble getting the DF to fill it. Not sure why they are using the PF for something that the DF is better suited for and even designed to fill, since it will pull in anyone that queued for levelling or mentor roulette.