I'm presently doing a short not format for intitial responses because when I say too much and get too detailed and find posters have a hard time understanding, it's better to start off with short notes to establish that.
It sounds like you are seeing the same thing I'm saying which is that the profile collapses in when smiling. Alveolar process is the part of the jaw bone that HOLDS THE TEETH, the bone underneath (posterior to) your gums
This arises from soft tissue making your upper face look MORE forward grown than what the bone area itself if doing. So, when you push your face forward (with a lefort 1), it would tend to look overly protrusive and that would be due to relatively thick soft tissue over the bone and also due the orientation of the nose base where the ANS is. So, IMO, you would need to explore possibility of a deprojection rhino. With ANS reduction where when one gets ANS reduction, they ALSO usually need OTHER rhinoplasty support techniques with that so the nose does not 'hook' down. 'Wrench in gears' refers to many maxfax docs NOT being very conversant in the litany of rhino techniques that might go along with deprojection rhino with ANS reduction.
Hence, consult with good rhino guy first. You don't have the type of structure to get the rhino after the bimax. You would also have to tell the rhino guy that you PLAN on having the maxilla projected outward later down the line.