Hey i just tanked 10 man 3D and i re-speced about 5 times and this spec helped out alot with keeping my hp up, if healer was needed for something else really quick and i basically did not need all CD's until sarth got 100% dmg buff. When sarth got the buff i used my CD's 1 at a time and and popped rune tap after every breath just to help keep me up. blood aura did help but not to much and rune tap healed my OT's as well. Make sure your OT's are in your party so they get the heal from rune tap as well, its not much but whatever heal we can get helps.
Oh yea make sure you use mark of blood when ves comes down that flame breath hurts like a mofo.
Obviously this is only if your MT sarth and this spec is only for groups that are all caster dps.