Over analysis leads to paralysis.
Take a break.
Personally I don’t get the obsession to scream over high C ever was or is in the first place,
May as well get a piccolo and learn how to play C to F# below the staff for all the good it does to tear your hair out over the inability to play beyond what the instrument is designed for.
What I’m really getting at here is that once you get wound up too tight because you can’t do whatever feat you are trying to pull off you are finished until step back , take a break ,clear your mind , relax and understand that ultimately, the ultimate trick to the whole 9 yards , is time with the horn on the face, not days, not weeks, not months ,
YEARS and more YEARS. It’s the nature of the beast and that is exactly why I love it, what say you ?