PoE Vaal Righteous Fire, Canadican builds

I just switched out to a melding + aegis setup on my RF INQ. Trying to cap out max resistances at 90. Im currently at 87. Next step is: Eldritch Conflict on chest piece for potential extra +1% and a lvl23 purity for another +1% will get me to 89 max ele res. Where can I get the last 1%? POB: I know the last 1% is probably not that crucial but still. 90 looks nicer than 89....