Spins and Strakes
Spinning
From my imperfect memory of Chipmunk flying with the UAS in the mid sixties, the strakes were described as spin recovery aids. They may have improved airflow over the elevator. I do not remember any of the aircraft going inverted. Going inverted could have been caused by poor rigging.
A general handling sortie would end with a spin followed by a PFL (not below 250 feet agl).
Stalling
Each stall was never the same. Perfect aircraft balance was essential to achieve a textbook recovery. I was told that one aircraft was taken out of service when it would go inverted in the stall recovery. The aircraft was scarapped even though the rigging tested OK.
I was always more careful with stalling than spinning.
Mearns Loon