Most groups LOVE you for the 1K health of Ebon, your healer too, as the DDs live longer for the healer to have a chance to patch up again.
DK also has a handy self heal with Green Dragon Blood. Warden Tanks have a whole array of heals.
Personally i use all 64 points in Stam, and Glyph Health + 0-3 triple glyphs on the big pieces, and with Lord Mundus, Ebon & Tristat-food still have 35K health + 30k Stam.
Green Pact is nice, but a "selfish" set, e.g. lacks a group bonus. Personally i use Ebon + Torugs Pact with, as Allcast recommends also, infused weapons with Crusher & Weakening enchant (both potent debuffs you can inflict on a boss, helping the group further).
On backbar: 2h brings you nothing apart from 1 more heal, damage is not your concern. I would recommend the safe option: 2nd 1H+shield, or of like it flashier and experiment, an Icestaff... or if you want to meta more a lightning staff for elemental blockade lighting & the unbalanced debuff.