VoidFinder

http://poeplanner.com/AAYAAOUCAABwr-sB0f4JJyGVyMSip9T-yJuNW68hdobOwTMVILUIcaGPT38rOdRv8qCfdvcx-qGk4dsGIzB8UUeVBdnGMpR_AqbgCIma8V1oyqmNvwW16NYi6ud0bWw2PetjES8rCkcG0NBfasM6KjiP-uwYLL8V14auVmPy4WNDwcWIQoIeUDDB85UgLR8dTzW5pysRUG0Z34rpAkuuGyXZWyBuTLPjhA3RlwYZit0NHdlDVPRxFHV311b6exSkwlxAVL0V7ZaL1bmiow_EO3y4yudUJP3_3t74pHjB1eywjAu5fJS4G60AAAAAAA==

Bow = Caustic Arrow+Faster attacks+GMP+Phys project dmg+Inc Crit Chance+Inc Crit Multi
Maybe just swap GMP for Poison for single target.
Helmet = Hatred + Discipline + enlighten
Boots = some movement skill? Maybe Blink arrow.
Gloves = some temp chain/enfeeble/vulnerability setup?
Armour = Maybe a single target DPS skill like barrage or another caustic arrow
Maybe a wither totem setup

Bow = Darkscorn, Reach of the council (if rich)
Quiver = Asphixia? Soul Strike?
Body =Incandescant heart? Cospri's will?Might need ES (vaal regalia)
Gloves = ES, Shaper's Touch
Boots = ES
Helmet =Devoto's Devotion? Rat's nest? may need ES, since no shield
Ring = Voidheart, Dont need if get poison elsewhere/use poison gem for single target
Ring =Crit
Amulet =Crit
Flasks = Atziri, Movement, DK, DK, DK

power charge generation?
(hopefully drop crit chance gem)