Block is pretty useless in Uld, especially when going for hardmodes. Bosses are hitting for a better part of a tanks health and the gain from 3% isn't worth the 3 points. You could also use some expertise and hit. Grab the 19 Conquest neck, that'll be a huge upgrade over the one you are wearing on armory. Maybe even grab yourself a Northern Barrier.
Also, imp spell reflect is pretty much useless. Would be better spent on Deep Wounds. The two points "extra" in Shield Special could be tossed into Improved Disciplines, not that that will increase your threat, but your healers will love you for it.
For glyphs, I'd take Cleave over Sunder any day. And perhaps even Shield Wall over Devastate for extra healer lovin'.
There are a few good threads on this site about the priority of ability use.
Sorry if I was vague at any point, a bit tired from work today.