I have bits like that lowrez. This year was the first year that I actually can recall seeing the Kearsney College boys. I recall Arthur's seat completely differently in previous years. I barely knew where it was. This year I knew where it was but there was a rescue bus driving slowly in front of it.
Entire width, which was what caused the problem - switching to the middle or the other side would otherwise have solved it. I don't know why I found this a problem on the down and not at all on either up run.
I don't recall my toes being particularly bashed after the down run and I didn't do anything special to protect them.
What I would emphasise is that the cambers were a problem for me on the down run, in particular early on. I had a terribly stiff calf after only 6 miles. I had failed to prepare for cambers, having focussed on downhill technique and other preparation for running downhill, but this time I would aim to do some training to prepare for the cambers. I don't know what, though. Any ideas? Standing on one leg perhaps and other things to strengthen the stabilising muscles.