Not many backpacks come with hipbelt instructions printed on the lumbar pad.
Maximum setting. I don't know how many inches difference there is between settings but I'd guess 4ish.
Hypalon reinforced stay port and hypalon stay pockets on the belt wings
On minimum setting there is some overlap of the wings that creates a lump, it is noticeable through the lumbar pad but I don't know if it really affects comfort much.