I only play HC... so thats why i only have 505 mf... but I now lowered my mf to 347, so ill see what happens now.
I spoke to a friend of mine about this and he says he heard that 300-500mf is like a dead zon or something... so he uses 250-260 mf... he found tals armor and valor at 256mf... ill just play around with it i guess... or like U said maybe just a matter of luck.