Thanks Josh. I've hiked down to the falls and back out (which is more like mountain climbing) over a half-dozen times, and the light is never just right. Morning, evening, even mid-day, there are shadows. I've tried overcast and don't like the comparative flatness. I've photographed the falls when they were frozen solid, and that is the toughest exposure of all.
This is about the best I've done. I think next time I'll try a GND.