Shaman's Cloak 0/6, Moldavite Earring 0/6

Killed 3 Centurio X-I since yesterday, no drop.Also camping Mysticmaker Profblix in Labyrinth of Onzozo. Got only 1 claim from 6 pop (I know, I suck T.T) still no drop.Gee, how come these things are so hard to drop for me.