Blizzard should implement something like "Smart Loot" which will be up soon in Diablo 3. For example we have 2 plate users in the raid and on last week raid we had 1-2 plate drops from EVERY boss. Thats on full 13/13hc run, 10man. Not a single item was given to them, all was disenchanted. The current system working not very good... Especially in 10man.
My story, as a hunter.
Trinket from 1st boss dropped for our guild 1 time (about 1.5month ago), 24kills combined + ~15coins. Luckily i was the only one who needed it...
Trinket from 3rd boss dropped 2 times (1 from boss and 1 from coin to our rogue), both 3 weeks ago, 23kills combined + 23coins. Coined in total ~12 items, but not a single trinket.
Boots from 4th boss dropped 1 time (a day ago on my last raid), 23kills combined + 23coins. I also coined 5bracers, 3 bows and once a shared loot bow... But no boots, of course.
Thats all for me, all other pieces i have received weeks and weeks ago, mostly on our first kills etc. I was just unlucky with 2 trinkets and boots.
Few other ppl in the guild still missing some items, which NEVER dropped for them.
Anyway! I wish you best luck in next tier, hopefully it will be better :>