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> border also made me notice another interesting fact, the image
> displayed on the screen actually shrinks as it gets darker, and
> grows as it gets lighter.
This is common with all screens. Try setting your Windows background to black with no wallpaper; then open an Explorer window (which is predominantly white) and maximise it. Now keep a careful eye on the egdes of the screen and minimize/maximise the window a few times - you'll see you monitor does exactly the same.
Neither of the things you mention are actually faults with the console; the screen centring issue is common, and easily overcome with screen positioning options within games; why they aren't present in all titles, only the developers know!