I don't see the point to stack so much fire spell dmg when it's only good if you're using Seven Heads scythe or crafted one with a cataclysm proc. Also why would you need lghtn spell dmg? If Stormblast proc is the reason, it won't increase your dmg, because it just converts your wdm to lightning. If you're using Shaad RW, obviously, poison SD/-enemy res makes much more sense.
Looks like you got a mess in your gear. If you still have good skillspeed then it's ok, but you better concentrate on a single source of elem. damage (e.g. poison). If you have Dragonfire Oil smaxed, the keep these -59 res, its fine if you are aiming for -100 enemy res. Life leech is aslo fine.