If you were queueing up for something that a roulette wouldn't catch, what makes you think the problem was with you being a DPS?

More likely than not, there was simply nobody queueing for it in the first place. I spent 3 hours in a Labyrinth of the Ancients queue as a tank once, and it never popped, for example.

You're better off making a premade group in party finder for pre-SB extreme primals and such.