It might take a couple weeks until we can give an answer to this, cuz as of right now, nobody has any idea of the ias tables for the warlock, nor not enough info about the skills requiring ias instead of fcr.
I have pretty good knowledge on how to figure out those tables, but I don’t have the time (it’s not something simple). I’m hoping that some of our beloved users (I won’t name them to not push the pressure) will gift us their knowledge once they have acquired it
But until then… it’s random, yet already so strong that you should just enjoy testing stuff without caring too much about min/maxing your ias breakpoints.