I usually run with 640 or so mf on my Zon(s), 350 or so on Barb. I have found every Unique and Set item in game EXCEPT: IK Armor, Bul Kathos Mythical Sword, Maras Kaleidascope and for some odd reason I have never found a Humonculus lol. Oh and of course I have never found a soj lmao.

It is really all about random luck and killing as many monsters as possible, I once found two Arkaines Valors in Cows about an hour apart. And you know what? I have never found another valor since lol.