It's all luck or lack of luck. A buddy of mine just leveled a prot pally and got the shield in H CoS, Lucky sun in reg FoS, tank boots and the Black Heart in reg ToC all on the first run of each instance. Two night later got the 232 tank weapon out of H PoS and that pisses me off to no end. On the subject of Arcane Loopy of Bad Luck, I got the Seethe on the first run with my mage and the necklace on the third run. The same buddy's lock got the necklace on the second time.