Here is someone elese's view on this. The text is from a civilian Aerobatics manual. The author a qualified Military Test pilot and graduate of ETPS... and even referring to an Aeroplane with a typical WWII type wing.
The last line says it all.
Lets put this into a practical example that is a realistic life or death situation that requires your best possible turn performance in this case Min radius.
Lets say you find yourself 90 degrees nose down pointing at the ground. You are unsure if you have sufficient height to pull out you may or may not but you must give it your best shot. How would you fly the recovery ? Any delay makes the problem worse, you need your best Turn RFN. Get it right you live get it wrong you DIE.