FYI, I'm a little rusty on Frost, so Satorri, correct me
Agreed, I used IT for a very long time in all my builds, but you use RP for Rune Strikes, Frost Strikes, AMS, IBF & Hungering Cold. The first two are vital, while the last three are situational (and HC, frankly, is more of a solo/interrupt/panic button). I feel that IT would be the best glyph to drop in favor of HB, as you will use IT less once HB is applying the debuff, which means the bonus RP won't be gained.b) Glyphs: Glyph of HB looks cool but instead of what? The RP from IT i find very very useful. As for choosing between FS and Ob, that's related to my next question.
I have seen enough frost tanks asking 'why is my threat low?' then post a WWS log with FS outdamaging RS... but the threat benefits are reversed. Personally, I would rather lose a KM proc to avoid draining my RP. The benefit is you get more RS procs, but also have time in your rotation to do other things. IE, you are using FS, where I would Obliterate & keep the option of my next melee swing converting to RS. If the RS is allowed to go off, I wager I'm doing comparable threat via the RS alone... but I also got the Obliterate, a chance to proc Rime & more threat overall on a single target. In the other case of AoE, a KM'ed HB is invaluable, but that would replace the Obliterate. Note this is about threat, not damage output.c) RP management: I find KM proccing so much that i end up prioritizing FS over Obs and RS proccing far less that i expect. With FS atm doing more damage than my obs, i feel this is good but it leads me to RP starvation (why i dont want to sacrifice FS glyph). If i continue doing Obs as suggested in guides, i end up with max RP without enough RS to drain it.
The Sigil of the Unfaltering Knight is ~10.78% defense, 100% proc chance, 60 second (or was it 30?) uptime. Well worth employing for bosses, but I think Awareness is better in single target threat situations. I would review if boss survivability is a problem and go from there. I personally run SotUK as threat is rarely an issue for me.d) Sigil suggestion: I'm using the Awareness one as i seem to be most pressed on threat atm. Is the def proc one a better tanking one seeing it would help with IBF (yes i know i can survive but i'm usually using IBF on really big inc damage where every little bit helps)
I run Blood/Unholy, though blood is prefered by a lot of folks for the health and self healing. The healing provides a larger buffer on top of the larger health pool. On any fight where you can be two-shotted by the boss, getting a Death Strike or using Rune Tap after the first can prevent the second blow from killing you. Healers love this aspect, as they're not panic spamming fast, 'small' heals and can rely on more effective but slower heals.e) Blood spec: Every single good tank i saw is blood spec. Is it just for the EH? I was blood while learning to tank but i found the trash tanking extremely poor (and the spec very boring but that's beside the point) Is there some really big bonus except EH that i'm missing? Should i bite the bullet and relearn blood?
I run unholy, btw, for the anti-magic aspects. Frost can emulate a few, but neither spec has the 'omg hitpoints' that Blood has currently (note blood is losing 3% stamina talents in the 3.2, currently on PTR). Overall, I prefer blood. I moved away from Frost only as I wanted to specialize my tanking into physical (blood) and magic (unholy) styles.
Coming full circle, I would look at getting Armsman (2% threat/10 parry rating) back onto your gloves, and getting a expertise trinket (replacing Defender's Code) to get over the 26 Skill soft cap. The threat increase would certainly help, since it's on top of other modifiers (DnD, Frost Presence & Rune Strike), while the expertise ensures Obliterate hits.