I was recently working through a duet book with a second person in a small practice room. When I asked about physical embouchure changes related to pitch, he advised not to get too caught up in the mechanical technique but simply to listen and adjust until it sings. He said it would be intuitive before it was mechanical. In that small room, we played some simple chords together, and I could physically feel when the pitch landed. When one of us was sharp or flat, I could feel the tension. When we met each other and made the chord sing, I could feel that tension smooth out. Like it was a physical sensation on my arms and in my chest. I dunno if it would be like that for everyone, and I won't say that understanding the mechanics isn't helpful, but it may be worth finding a friend and small room to see what happens. Maybe you could feel it before you can think it?
Wessex Dolce
"Suppose we have only dreamed, or made up, all those things -- trees and grass and sun and moon and stars and Aslan himself. Suppose we have. Then all I can say is that, in that case, the made-up things seem a good deal more important than the real ones." - Puddleglum in "The Silver Chair"