I found it great help on Beasts encounter. Gormok and Icehowl cannot hurt you if you stack up on armor. I think that common agreement is to reach 40K hp with balanced avoidance while keeping expertise in the mid between dodge and parry cap. Once I reached 30K armor 40K hp without sacrificing any other stat - I tanked heroic Gormok25 without problem.
1) Get that trinket it's great on physical damage fights.
2) Don't be lazy - swap trinkets according to fights.
Mookey | GM of <RISE> Xavius [EU]