B2N2 - no offence taken, I just thought you'd somewhat missed the point of my post.
Re: spin resistance in individual airframes. There is experience that the range of control movement - particularly of the elevator and rudder can be significant. An aeroplane which is rigged down at the minimum available range of nose-up elevator and rudder in the direction you're trying to get it to spin can be very reluctant to spin. The big risk is that if the limited range is also the case in the opposite directions it can also be very reluctant to recover. One should be therefore very nervous of spin reluctant individual airframes.
G