You don't need to run it on heroic for that trinket. Just find some noobs that just hit 70 and run them through! Good drop rate for me.
Funny story:
So we're running SH for the first time on my Pally tank, just hit 70 a few days prior. So we're rolling with a guildy Resto-Shammy that no one is quite fond of(known for a ninja before and inability to play any class he tries). This shammy(who I had only heard about, first time I had rolled with him) would lightning bolt and melee as the healer.. We wiped a few times because of this until my roommate told him to cut it out. Killed the mood, but meh, it was needed. Anyway, we reach the end and behold! The trinket drops! I had no idea it existed until that point to which I, what scientists label, freaked-the-fack-out.
So our shammy healer, we'll call him... Frank. Frank says "omg need!". The 4 of us laugh! Make silly comments! Good times had by all!
=D
...
......
..........
Then he selects 'Need' on the UI roll..
I will state that a common rule known by anyone who's played this game more than a month knows that in a group you always pass on BoP gear. Common courtesy. So rolling on an item using the UI option is bad enough. But on a tanking trinket.. not only used by a Shaman, but a Resto Shaman is something that made me just, snap. I don't know what happened, the words I typed were some of the most malicious, asinine, horrid and demonic things I've ever typed to another person, nay thought! Is this a rare drop compared to other loot on this guy? I didn't know at the time. Our "healer" left the party after apologizing, stating he "thought it was just a shield-person trinket." After that we got another healer and ran the place 2 more times and it dropped. The guild leader(who was with us through the whole ordeal) told me it was a common drop off this boss and not to worry, that we'd get it. Sure enough I did. After that point my roommate and I swore to never run with that guy again.
2 weeks later he quit WoW. There was much cake to be had.
=) Yes, I am an addict and a horrible person.