Unfortunately for attackers, the closer you get, the more accurate the result.
You can tell the real 90 degree screamers, like the Ju87, they have dive brakes and a folding bomb crutch that swings out as the free-falling bomb accelerates away from the braked aircraft and the bomb is carried out far enough to miss the prop.
Dive bombing is tricky, even 5 degrees feels steep and 45 degrees almost feels vertical! The Spitfire would have trouble sighting the target under the nose, they would have to approach in a turn or, offset and judge the relative angles by the height and the position of the target relative to the wing leading edge or similar.
The inherent greater accuracy with dive-bombing did make-up for the often wildly flown aiming, the variables of speed, dive angle, release height and pre-calculated sight settings were
considerable.
Is the whole document available to see please?
Cheers
Eng