Sorry guys,but this discussion is more-less worthless,because sight(ASP-21-PFD)in this simulation does not represented real sight.
In real life a pilot has at one's disposal a bomb charts.There he can find proper values of A/C speed,height,dive angle.Next, there is value of aiming angle,which he must set on sight,by rotation knob on right side(ANGLE SCALE).
The switches on head of sight must be set in: B,MAN and SS position-nothing more.