i'm focusing on the monk dungeons at the moment. with Nemesis bracers and In-geom, the Raiment one is the easiest IMO. mastered it on second attempt after studying the map.
the Inna one is tricky, you have to properly tune your damage. too high and you're killing critters too quickly, too low and you'll be loosing time to achieve the master objective.
for the other 2 monk dungeons, among other things you need the fire-immunity amulet, which is hard to get.