Not an official response either, but I made a spreadsheet on google drive that calculates magic dmg.
It doesn't include ebulliance or magic burst but I think I got everything else in there to work.
easy mob (70 int) (normal mob 100 int) (tough mob 130 int). on the 2nd tab there's a method for approximating enemy int & mdb (really mdb&mdt combined).
If you look at Kaustra or Meteor on the right side, they will get better dmg w/ soothsayer easily. Helix's and many low tier nukes will too.
Oh, right. My calculator doesn't change the formula for extreme dINT terms. Only the formula used when dINT has not hit the inflection point is used, so if you enter say, stone & a dINT is 60, the dmg listed and actual dmg will be greatly off since I didn't get that far into writing it yet.
https://docs.google.com/spreadsheet/...FE&usp=sharing
I'll try to collaborate with some friends who know programing to make a live webpage when the new magic dmg formula has been determined & include everything.