Which oils should I use for min-maxing profits on blighted maps? Also which ring annointments are the best? Soo, I've accumulated quite a lot of blighted maps over the course of this league, got a bunch of t11-15 waiting to be run but I have absolutely no clue which oils are good / worth using to maximize the profit. 

Can some people elaborate on which oils yielded the best rewards?  what does "lucky chests" mean? Also which tower uprades should I focus on when doing those maps? Im a bit lost atm, hopefully some people can share their experiences.