Hi HazelNuts39...
Yours,
"The pressure distribution around the wing is the same as it would have out of ground effect at a somewhat greater angle of attack."
Are these relative distributions reflective of the arrested trail? Would the clipped vortices not reflect a change in the global distribution?
Doesn't the 'effective increase in AoA' more or less demonstrate an increase in pressure under the wing, forward of center of lift? The RamAir effect alluded to in Machinbird's lonk to the ground effect description?
Thnks