Those definitions only work for lamina flow once your past that into seperated flow and stokes flow your into a whole different area of aerodynamics of a none linear nature.
In which purely increasing the angle of attack will not give a predictable responce for what you would expect. It may very well increase the drag then reduce it again etc etc so just getting the plane flat won't garantee anything.
If you could stop the spinning and have it flat falling I will give you that its going to be more.
The only way to find out would be wind tunnel testing to find out whats the best nose attitude to spin at to create most drag in the vertical plane ie the direction your dropping.