Tri-Elemtal Sorc, Take two.

[arrunique]

isn't there a dusk shroud, that improves elemental dammage, or descreases restsiances?

Ormus' Robe gives up to 15% extra damage in each element and has +3 to one random sorc skill (other than masteries, hydra, and orb).

If you could find one with +3 enchant and 8-12% in fire and lightning then it will be worth it, but I think the +2 skills you can get from chains of honor would serve your cause better overall.