I don't use a pick to do pinch harmonics. I'll finger pick using thumb and index finger, moving towards the bridge side of sound hole or more towards fret board to attain different tonal harmonic qualities. I'm glad you posted this video, because not many players that I've seen readily use this technique when playing acoustic.
This was a spur of the moment video. I'm going to be recording a much better video demonstrating the technique in the new year. Thanks for the feedback.
