Thank you for the imput Robert. I will work up on it. I have already made great progress thanks to TVS teacher Olivier Tronquet with who I have taken several classes aimed at developing head resonance.
Regarding your version, I was quite impressed by the overtones you get on your screams. I have heard a lot of distorsions as i like to listen to hard rock and heavy metal, but it seems you achieve to produce overtones one octave higher from the pitch. Usually, false vocal fold distorsion produces a second tonality one octave lower.
I was about to think that you overloaded your mic to produce this sound, but if this is all produced in your vocal tract, then yeah, I have no idea about how you have achieved it.