haven’t got that high yet.
but on notes in the stave, I have a tendency to engage the chest as I have done for years.
as a trick to break this habit I have been trying to set the shape then just let the air fall out ( very passive ) to get a quiet note and the feeling of playing with no engagement.
I know you cant okay like this but have a very strong link between thinking higher and engaging /push which I want to break.
Keep messing about and experimenting. no one is listening and nobody cares how bad it sounds, Keep having fun.