Well don't you need discordance? Generally eternal build not recommended as you can't edit it more than the gear you found. Also inferno isn't really recommend with fire due to preserverance legend affix. Even then, I dealt crazy bleed though but that's due to scalps powerful nature. Even stealth wouldn't work at PvP but amber crystal doesn't work on eternals unfortunately. Interesting build combination though. Not much I can do to help for that build other than using non eternals but if you seem to do very well in it , by all means keep it.
Still my orb build is very powerful due to the fact that I have Discordance and 6x ED. Also the affixes to be recommended are 1-2x PTL, 1x WD, 2+ extra attack Mythstone , 2 multi attack legend affix ,Reactor set, Defiant, Vampiric touch, Plagued, Living Force, Demonic and the Identity Set. Also add crit dmg and crit chance like we crit chance, 1x crit dmg with 6x strength nature of 1x crit chance, 5x death nature, 1x strength nature and 2x 53% crit dmg. Of course some HP and MP too. This is for non eternal build though.
I mean elemental crit and high voltage works or just stagger with high voltage but that's up to you. I don't need elemental crit though so that's fine.
The build I posted is the easiest one as it doesn't need the eternal MP pet I have and it can be replaced by a non eternal version and still be successful.
My other pet for this Will of the Force build is:
If you have a vampiric touch/plagued pet with HP and MP, that means one slot can sacrifice HP for another 1040 MP to reach similar amounts. No MP regen but that's also ok . The crit dmg on that pet was merely a bonus as well as 9% total HP epic affix. It's a very nice pet.