As you know, with the latest patch, a lot of the loot tables have been ravamped. A lot of items have been moved (all chestpieces to Golemagg) and even some don't drop anymore (Anything tier2). I am not sure if you can do this or not, but I'd suggest that you erase all records on MC bosses prior to the patch because with the loot movements, the drop %s could have been radically changed. Yes, that will take away some of the loot that still remains on the boss, but over time, everything should go back to normal.
Also, is there a way to see what drops from Domo's chest?
-Stormspire
-Mage, Illidan