Sorry you are having so much trouble getting into this dungeon It's actually one of my absolute favorites! I love the battlemage gear ^-^

But you should try to find a helpful LS or FC and see if anyone can help you out that way!! I find my FC is absolutely indispensable in situations like this and it usually more fun going with people you are going to get to see again on a regular basis (at least it is for me).

Good luck to you on your adventures!!!