On Spins,
Personal preference. I'm not afraid of them, in fact I taught them in the USAF as a T-37 IP. No I'm not claiming any issue with the aircraft and spins. I just don't think they are needed in the aerobatic test phase.
In the aircraft handling, I would like to see pilot proficiency in:
Nose high, nose low, power on, power off, straight, turning, 1G and accelerated stalls.
Nose high and nose low recoveries.
Recognition and recovery from imminent spins with a spin prevent and recovery after 1/4 to 1/2 turn.
The pilot proficiency should be attained BEFORE the test phase, so that would mean different airplane. Don't attempt to test fly a new airplane and gain proficiency at the same time.