Page 106 of
Dive Bomber by Peter Smith talks about the dive bombing trials the RN did with the Swordfish:
https://books.google.com/books?id=KTmKAAAAQBAJ&q=swordfish#v=snippet&q=swordfish&f=false
The big thing about any divebomber is to not past the VNE, the never exceed speed, so bits of the aircraft do not break off, to not overspeed the prop, the dive angle such that the bomb will not strike the prop, and the aircraft can pull out of the dive without:
Pilot Blackout from too many Gs
Wings or tail do not fail from stress
smacking into the surface
Stringbag has the advantage of even in a powerdive, has enough drag to keep the speed well under 300mph
One reason that the Vought Vindicator did so poorly was it didn't have real dive brakes, and needed to lower the landing gear for the drag. Too much Flap would blank the elevators, lessening their effectiveness to pulling out of the dive
Even with that, was easy to exceed VNE and the fabric covering would tear loose from the aft fuselage, si it was limited in practice to 40 degree dives