If your trying to lvl with instances, you should really only being doing roulette once for the bonus, in which case ifrit/titan/garuda are a win. Otherwise you should just be menuslly queueing the highest 2-3 lvling dungeons and just taking what comes first.

Side note you can make a custom roulette of up to 5 instances with a party of less than max size, that can fit into recommended setup.