To be fair, as a tank who's done AK a lot, there are times where DPS is really low and it takes forever to kill the first boss. I usually carry on the run cause I like to give things a go but more often than not you wont get past demon wall due to the purple stuff at the back and it moving towards you. Once you get into that purple full time there's very little chance you will win, but it is possible.

A lot of tanks can tell when a run will take 45 mins and when a run will take 2 hours from the first boss and just leave. My advice would be to just run with LS/FC cause then you can work on it together where nobody really minds what gear you're using, or hoping you get a tank that sticks it out so you can get a bit of gear from the dungeon and gear up as you go.