I've been experimenting by putting uncommon armor on right before the loot drops and bringing my level down to 20 and every time i have done it, i received at least one piece of raid armor! I got all the armor i still need by doing it this way and will have all level 30s now. Try it out and see if you guys get better drops
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I'm not sure your level/equipment at the time influences the drop..... kind of wishful thinking IMHO.