Salute!
@FDR, et al....
I would bet that the 'bus is statically stable in pitch in the direct "law". Not "speed/AoA neutral" stable In other words, take out the "protections" and have the stick command control surface movements directly. Relaxing the stick to neutral returns the surfaces to whatever "trim" posiiton existed before moving the stick. Gotta look back at the FCOM for that mode/law WRT trim, but think it was control surface position as we had in planes since Glenn Curtis, Boeing brothers and Kelly.
The Viper also appeared neutral WRT speed/AoA when close to one gee flight, but like the 'bus, that was due to the FBW control law and not basic aero characteristics, pitch moments, etc. Using our pitch override function when in a deep stall resulted in "direct", proportional movement of the stab, just like the 'bus. In short, we could tell HAL to go take a leap until AoA below 30 degrees.
Gums sends...