Although, blocking and other factors may be key here... I've started eyeing my other trinkets that have been gathering dust. Namely the Rune of Repulsion, as I don't have a Defender's Code. Untill recently, I scoffed at these trinkets in favor of my Essence of Gossamer and Alch Stone.
The thing that started all this is when I swapped in my Repelling Charge instead of the Essence. To me (and my healers) the avoidance it grants has a much larger impact than the small HP buffer. Then I realized that the Alch stone is pretty much the same, save for the Dodge. If not for that Dodge it'd be banked and there would be no issue.
The Rune of Repulsion grants 1.93% parry and has a nice Use (7.6% parry for 20 sec). The Alch Stone grants 1.2% Dodge and +75 Stam.
What it comes down to is 0.7% Avoidance & CD VS +75 Stam & ~1,300 more HP from my potions.
I'm sure I'll get a new trinket and I won't have this problem anymore, same thing happened when I was trying to get block capped. And I know what I've described... trinkets are situational.
I guess it took me all that text to basically ask, what are you guys doing in Ulduar when it comes to your HP vs Avoidance? Without HP trinkets I sit ~35k buffed, without a priest. (10 mans... what ya gonna do
