My first clear was on my Magblade with dual Destro and higher sustain than normal so I could get through. I find it more effective than your present build due to the DPS potential, but not too shabby at all. I would drop Infernal for Iceheart. Iceheart gives a damage shield that is like a low damage of Grothdarr AND has a chance to apply miam.
17.5k Health is rather nice to have but W/E 16.6 works
You SHOULD have 3 dots. if you aren't comfortable with that then ditch Magelight on back bar and it refreshing path there (Trust me this skill is awesomely useful)
WoE
Cripple
and Path (Refreshing is my personal fav but Twisting is more damage. I can still pull 34k DPS with twisting)
I've seen people run shades and Necropotence. Shades can be used to apply maim and proc Necro
If Sustain is an issue and you want to clear up a skill slot then do 5 PC Alteration mastery and 5 PC Juli with Willpower Jewlery and that should enable you to ditch Siphioning attacks