Peddy,
Yup - they are angled back - the post seems to be stamped from the bottom of the tunnel.
I have a 1948 - 1952 wooden stocked Model 5, and at 6yards, it shoots about 4" high with the rear sight at its lowest setting.
I have pushed the post a bit to 'heighten' it, and got to ca. 3" high, but don't want to go any further as I am also worried about the post snapping off
I just do a very radical area aiming below the target black now !
Have fun
Best regards
Russ