I encourage more reading of Typhoon pilots and their exploits:-
snip
Flight Lieutenant Hardy also mentioned his time in No. 6 Tactical Exercise Unit in Scotland taking a dive-bombing course on Hurricanes prior to transfering to a Typhoon Squadron.
Wing Commander Hugh Godefroy in his book 'Lucky Thirteen' also made mention of his success deviating from the perscribed 60 degree dive—which his Wing "discovered that this technique of dive bombing was extremely inaccurate"—and diving straight down instead. But this was with Spitfires. Release also had to be during pullout with Spitfires due to the—as has been mentioned—trouble with centreline bomb rack.
Precisely - official policy even then was that it wasn't safe to go over 60 degrees, but individuals in practise went with steeper because it worked - more accurate.