The relative wind will be "coming from above", since that is the
direction in which the aircraft is traveling.

The relative wind doesn't ever "come from above" while the aircraft
has a positive angle of attack..by definition. ;-) Nor will the
aircraft stall with the relative wind "essentially horizontal."
Sounds like you think there is a zero angle of attack in that
situation? Cannot be true.

When not pulling a g-load, an aircraft climbs because the *flight
path* is inclined relative to the horizon; the AOA depends on the
chord line angle with the *flight path*.

If your level flight stall speed is 53 and you're stalling at 60,
you're probably achieving an accelerated stall.

The flight testing guys try to decelerate 1 knot per second; oddly,
decelerating at a greater rate produces a *lower* stall speed, which
must be normalized during the data processing. (I'm sure this only
occurs up to a point.)