Maybe you should choose a different mob for the grinding. I'm just 31 so I started with skorpions and they dont give me nothing. After that I change to gunpowders and I started to have so many drops that I've started to drop my own arrows being an archer and leaving the city with just 1000 arrows.
My advice, go to easy mobs (gunpowders continue being white to me), kill them quickly, get a lot of items. I have to recognized that non of the items was actually good but I made space with the destroy rondo and continue grinding.
so they said 100% increase?
Alot of you say luck has to do with drops,,, its not,,, the game like many others has a drop system(luck would make it to unbalanced),,,,you want the drops,,,,go to greens,,,should be 2 types of greens for your level atleast. One of the 2 greens will Drop your items for 25 or more an hour, ,, less when even is gone,,,, but always . Luck,maybe on upgrades, but not drops,,,,,,,,,Remember specific mob, (type Green)