I was a QFI at Barkston Heath on the Firefly and had no episodes to speak of. The only thing that worried me was the propensity of the aircraft to enter the incipient spin in almost any stage of flight. (I exaggerate slightly)
I understand that the USAF had some issues with spin training and the Boss at Barkston at the time told them what they were doing wrong - which they liked even less.
Colorado Springs is at some considerable density altitude - IIRC about 6000' on a good day so even a climb to 10000' does not give you much to play with if you are going to set a Min Height to Commence Recovery.
They would spin without parachutes.
They used IP's rather than QFI's