Took me less time to get my first set of 12 Atma's and I didn't farm any fates in particular. There is no gimmick. There is no right or wrong fate. There is just a series of fates you run. I have three atma of the scorpion and not one came from particular fates, areas, or types of fates. 2 atma of the maiden, same thing... I could go down the list. I farmed for a couple hours yesterday, two drops. It's not skill, it's pure luck and of course a little determination. Upper La Noscea was running back and forth between the East and West areas till finally it dropped. Transport to next area (East Shroud), three random fate's later - atma. Not the same one I got the first time. I can only hope my luck continues, especially reading some of these terrible posts of hours wasted.