You have some excelent guide on DMG here:
What I could tell you just by look is to find another +2 All sets, use 6 sets, just use WeaponDMG on the weapon that are you main source of dmg like if you are using Torrent, remove WeaponDMG from Hammer, preffer % affixes instead of flat ones (in PvE), look for drop itens like Munity(MH), Ragnarok(MH), Insolence(OH), Aether Wrap (Armor), Nadroji’s Robe (Armor), Epiphany Hat(Hat, lol), Cognition (Ring), Entropic Jewel(Amulet), Frightening Choker(Amulet)… In order to have some huge boost with affixes that can’t be obtained in craft, like ElementDMG%, Epiphany set, Epiphany Bonus Affix and Push the Limits… Look for combinations of sets that focus on Element boost, like Druidic+Plagued, Arcanist+Ascendent, Frozen+Permafrost etc… And you’ll be good for PvE for a long time.