The Tucano spin recovery was very predictable if completed iaw the taught technique (ht, Idle, opposite rudder, centralise CC, centralise rudder immediately spin stops). Two hands were invariably used during the spin to prevent the ailerons from 'snatching' and hence applying an unwanted roll input. Any in-spin roll input would cause the spin to become more oscillatory.
During recovery, if the CC was moved further forward than the approximate central position then a pronounced bunt would ensue as the rotation stops. As well as the negative g being uncomfortable, the rapid increase in IAS caught some people out.