Zen drop

[Fraancoo]

Hello people, good evening, what I am trying to know how to modify is the amount of times that monsters drop zen. For example when I am killing every 8 bugs 6 they throw me zen and 2 items. Change the "itemdrop" of the commonserver by uploading it, but it does not differ. I also look at the Custom folder, but I can not find any option. I can only freely modify the amount of zen with the divisor, but nothing more.

Any idea how I can do this? They are files evolution premium season 2.x

[MentaL]