You can get a crazy amount of flame cores from Attalus elite zone chests man. Elite and reg chests. So you can snipe that zone through out the day and get what you need.
If you go to the rabbit island and kill Stanley the rabbit there is a lost soul guy that spawns and he drops both human bane and ward craft mods fairly often, was there for 30 minutes and got a total of 6 craft mods
You know what I would love to see? A way to upgrade your aptitude caches. To make a 3-Star, you'd need a 1 and 2-star cache, or three 1-star caches, for example.