Have you tried setting z height to increase the bounding box size in z? Is the object rotated? Can you send me the gltf/glb file so I can try on my side?
The issue is the origin is not centered with this model when it's rotated, I will look at adding an ACE which creates a centered bbox, shifting the origin and the size at the same time. This may also need to be a property for it to do the same in the editor. Right now I have to do this to center it:
