From a gear standpoint, I'd say your easiest immediate upgrades lie with obtaining the ilvl 226 crafted belt and boots (Indestructible Plate Girdle and Spiked Deathdealers respectively). Runed Orbs are pretty cheap these days so they should be relatively easy to acquire. Outside of that, you are certainly capable of tanking 10 TotC.
For tanking adds on Jaraxxus, I'd probably switch out the onyxia blood talisman for one of the brewfest trinkets (if you have them) simply due to all the spell damage getting tossed around in there.
As far as spec goes, I'm a big fan of my 15/3/53 deep wounds build, but there's nothing really wrong with yours (though I don't know if imp spell reflect is really worth it).
Overall, just keep gathering those triumph emblems and check out vene's recommended pick order. The Emblem of Triumph Pick Order - Warriors - TankingTips.com