There is an extreme shortages of tanks queing in the duty finder and that's basically because of how the dungeons are accessed... E.g. I'm a level 38 tank, but I only que for a dungeon if I hit one in the story line. I get 10* faster exp fate grinding and doing battle leves/leves/quests than a dungeon. Atm there really just isn't any incentive for me to run a dungeon. Now when the story line can't progress I run one. And of the 15 or so dungeons I've run so far I got an INSTANT, literally instant, que every single time. My FC is like, hey Ryios que with me!!! and we get instant ques. So that also takes effect. Most dungeons I run outside of the main story line I run with my FC and we pick up 1 dps or 1 healer. Sometimes we have a full FC run and don't use the duty finder at all.