My psyco has 681 instinct, just set all points in this attribute. And then all my equip have the highest instict atrribute.
Broken Promise (Speed+18, Instinct +54, Vitality +18, Fire Defense+45)
Jhonson's Legacy (Speed+5, Instinct+71, Vitality+14, Fire Defense+45)
Hallowed Gloves (Speed+7, Instinct+55, Vitality+7)
Bite Proof Pants (Speed+22, instinct+36, Vitality+15)
Calf Hooks (Speed+8, Instinct+24, Vitality+47)
Wrath Of The Council [Two handed weapon(Instinct+152, Ice/Lighting/Poison piercing+81)]
And I haven't already unlock zone 7
Dark Infusion, corruption, dark echoes, terrify, psychopath form, epiphany, free will and implosion in your pool, overdrive and tenacity as passive skill it's all you need. And you have still 4 point to use at lv 30 (the max). just go in psychopath, do epiphany, dark infusion, dark infusion, dark echoes and implosion and you enemy's HP bar just go down so quickly (Just bosses resist to this combo, regular enemis die before, at the firs dark infusion). Keep your teammates in relentless (also veradux xD) just see you enemies die. Give to Ronald EmbedRifle 2012 (+411 fire piercing) and see his 2k+ damage (veradux does 100 damage and 1k with electrobolt but who cares, enemies die for my uber DoT caused by epiphany) and it's what you need. At my advise, is the best shadow build.