What're your findings so far about the Diadem?

What're your methods/discovery for spawning NM in the Diadem so far? Suggestions on best spot to farm?

The island with the Dinosaurs. It's extremely boring, but it's the most effective way.

is there any difference between easy normal and hard besides difficulty like better drop rates etc

hard has more iv ranks iv ranks have a better chance of spawning tracks which spawn rank 5s/stars