FYI - a lot of hi-end headphones, for better or worse, are being tuned to the Harman target (w/o EQ) because of the accuracy/tonality of the sound to our ears; fortunately, we can EQ the Q30 (and a lot of other headphones) similarly if you like the Harman target; you can EQ any headphone to sound whatever you like for that matter
it is unclear why you think you need to have different EQs for different genres of music; if you think about the physics of sound, that makes no sense - an instrument/voice playing Middle A or Middle C should sound like Middle A or Middle C regardless of the genre; if you want/enjoy more bass/treble/mids/etc. than what the artist intended, then you do you
you continue to use so-called “audiophile” terms like “constricted” and “open” that mean nothing in the science of sound but do mean something to you so i can’t really help you there and question the usefulness of “further conversation”; the only thing i can suggest is searching/googling “audio myths”
remember, no one is right but you when it comes to what you want to hear - as the saying goes: opinions are like assholes, everyone has one, most of them stink
hope you find what you are looking for (and doesn’t stink) so you can enjoy the headphones
peace