It's either the combination of Iso E Super with something else that makes Terre D'Hermes and Encre Noir intolerable for you (and me, frankly), or, it's that something else entirely. I've been curious about that too, and I haven't been able to figure it out. There's something in Terre D'Hermes, Encre Noir, Azzaro Visit, Michael For Men and others that I can't stand. I have no idea what it is. I thought at first Iso E Super was what they all had in common, but I like Molecule 01, so clearly there must be something else.
Maybe it's the combination of Iso E Super WITH something else? Or maybe it's that something else entirely? I sure don't know... but I am curious.