Hi Hugo,
I am always struggling with the basics. I continue doing the WindWorks methods, and I always start having problems. So I briefly return to the beginning. I begin with breathing, concentrate on my aperture corners, and stop playing beyond my MTM mastery level range. Mostly, I come back stronger. A few months later, I start again. If that sounds demoralizing, it doesn’t have to be your story.

I am not sure of your microphone’s quality. Your sound is not as brassy and clear as I would like. It all starts with the backswing. You seem to be taking a very little backswing. Watch the backswing videos again. Practice just the inhalation and the release without a visualizer. The tissue will pop away. You can’t have much passive reduction if you don’t start without taking the concert hall breath.

Do the visualizer again with the concert hall breath. Then try it with the mouthpiece and then the lead pipe. The air will interact with your lips to create a ringing trumpet sound.

Cheers,
Ronald