PB elementalist Build help

https://maxroll.gg/poe/pob/jsjuy0ag basically rage quit at the league sold gear then decided to make a pb to waste time. gear is scuffed but at a point where i can do t17 farms to save up for more upgrades. just wondering if i made any bad mistakes with gem setups and what not currently in the proccess of crafting a proper helm and chest piece but just wondering if bereks explode ring is worth using with explode chest