The ussual answer is it depends on the contnet your tanking.
Im seeing you have some ZA gear and some Gruul gear.
Are you planning on progressing into SSC/TK and beyond?
If the answer is yes then I would suggest more +15 stam gems in your gear and less mixed ones.
Your armory link would be great if this is your avoidance set with 27% dodge, but for threat/trash that has to be hard on rage generation.
So if your using this set for threat and EH, then it kinda losses.
I personally have the bonefist and I was using the Maiden ones before that, I find the T4 glove suck just about as bad as the T4 pants. I never wore either.
Todays Badge/ZA gear really provides better options in most slots than T4 or even T5.
Your gems should reflect what your tanking, if its going to be new content then you should stack stamina gems to help your guild get new boss kills. Keep a avoidance set of items and use avoidance gems in those.
I personally have several sets these days:
Threat - Trash and threat fights (Void Reaver/Gruul)
Max Hp - New bosses
Max Expertise - For bosses that Parry Gib (Bear boss in ZA)
Max Avoidance - For bosses that hit like a truck (Morogrim Tidwalker)
5 Resistance Sets - Frost/Nature for Hydoss
There is something so appealing about backhanding someone across the face with a shield.