cwatters writes
Has the possibility of a fault with the PF stick been ruled out?
With an AoA of greater than 45 degrees, neither the wings nor the horizontal stabiliser will be acting as aerofoils, but simply as drag surfaces. Therefore it is unclear what the effect of any stick input would be.
It is certainly difficult to visualise how there would be any roll authority, and pitch authority could conceivably be the reverse of normal. Therefore theorising a fault with the stick seems a step too far.