For the first experiment, a level 60 character with 3453 CP was taken. We checked 4 locations of the Abandoned Iron Mine Work Site, Cron Castle, Cron Castle Entrance and Marni's Underground Facility.

Below you will find a table with the received drop and video as evidence. Unfortunately at Marni we used a different build skill. But despite this, the best location was the Cron Castle Entrance in which we destroyed the most monsters

Эксперимент. Дроп за 30 минут фарма в разных локациях

We can conclude that it is best to farm in that location where the monsters are the weakest, while they must remain orange for 200% drop

We also recommend watching a similar experiment from Legit Mobile