I'll go with that! Yup yup, them darn wind rotors!
Being serious though, I am somewhat careful of winds that may be passing over the mountain faces. I have a fear of being sucked over the top and pushed into a radio blackout.
I think my plane, mainly the aft end, is flexing the faster I go causing wag. Right at that point I could feel it starting to wag. Any time I accelerate at a high rate or go over 55 mph it seems to cause wag. I think I need to center my rudder a bit better as well, this might contribute to the wag.
The ground recording for the flight, shortened.
http://www.youtube.com/watch?v=ssWwtGyGCXg