They must have worked or the Skua wouldnt have been able to dive bomb. Skuas sank the cruiser Konigsberg in Bergen, 16 Skuas got either 5 or 6 hits by diving into a Fjord from 11,000ft releasing their bombs between 1,500 and 3,000ft.
I wouldnt fancy diving a plane too close to those mountains.
With no dive brake at all, the Vought SBU2 Vindicator could do 60 degree dives(by lowering gear), that came off very poor to the Douglas SBD or Aichi Val ability to do vertical. 75 degree is about minimum to be considered as a good dive bomber.
Late mark Corsairs had rudimentary dive brakes(and could lower gear for more drag) were limited to 60 degrees when centerline loads were carried, as had no swing out cradle for the bombs.
Since it had the same bombload as a Curtiss Helldiver, it became the choice for Marine bombing, as the Corsair wasn't the flying Turd that the Helldiver was. Even though it couldn't dive as steep.
So why did most of the successful divebomber be able to do near vertical dives?
Better accuracy (They have ONE Job....)
and the steeper angle made targeting difficult for AAA crews shooting at them
Back to the Skua. once the bomb was dropped, it wasn't armed as well as the SBD, or the range. SBD-2 had 310 US gallons, vs 166 Imp of the Skua