Drop rate nerf

Not sure about Global but it was 6 levels at first for MSEA before it was switched to 11 levels.

On Global it should be 11 levels or higher and all you get is ETC, potions, quest items and I think rarely equips, scrolls, familiar cards, and such. But to my knowledge mesos are completely gone by 11 levels higher. That is until you get to... 160+? I think it is. Then after that any monster above that level counts as "within your range" even if you are 11 levels higher.

I do believe though once you start going over the monsters level drop rate for that monster is slowly lowered until you hit that 11 level mark.

Yep. The nerfing starts at 6 above, then increases until 11 above, at which point you're out of luck (unless the monster's above 150 -- I always forget that, haha).