This is quite a site. Hopefully we have time to do more than a cursory inspection.
Have you been following the current wind direction, based on dust tails behind rocks and pebbles? On the slope at Gibson the wind seemed to be coming _from_ the northwest, perpendicular to the slope. On top of Homeplate, it seems to be blowing _toward_ the northwest (a 180 degree difference) or along the slope (a 90 degree difference). I imagine that the change in topography has caused this difference, but the change seems rather extreme.