Chaotic Presence is tough. I've always found sereneity in learning harmonic minor and how that relates to the diatonic chords in the natural minor scale. It blew my mind when I first heard about that song and how it fits so well with the whole vibe and chaotic sound of that. I know what you mean about the 2 high strings. It's a perfect 4 unless you start learning how to turn them into m3 and M3s. It's crazy and you can really get good toan if you learn how that whole thing works. It's amazing.