Glock aftermarket sights, or sight alignment help

[gregarat]

I bought a Glock 19 just after Christmas. I love everything about this gun except the wacky sight alignment. According to the instruction booklet the front post is half way above the rear dovetail. Is this actually correct? If so why would Glock make the alignment so awkward? At 25y my target has a vertical string .

If I bought adjustable sights, could I raise the rear sight to make the alignment "normal"?