Challenge Feedback - Formidable Flashbacks

This challenge was very tough to finish in SSF. With 211 hours and 1.6 million kills I've only dropped 5 memories. It is difficult to get 150 explicit modifiers when its impossible to even reach that number with the extremely low drop rate.

The worst part is that only three of all memories are even worth running in trade (beasts and essences and harvest). Can it get the same treatment as valdo maps or buff the other memories so they are at least worth running.