what i did was i started on the first atma on the list and just went down the list i would send my retainer out for a hr random venture and when the timer was up i would go back and see what i got and then run a dungeon or work on something else for a bit or just run another hr grind session also lots of movies and good music really help the farm currently leveling weaver and after i hit 50 i will be farming my second atma for sch if there not droping for ya i know its frustrating just take a break and do other things till later