Sorry for your trouble Digger.
When the road is that bad, and steep too, I treat stop signs as highly optional (if there's no cross traffic).
I once put my left foot down in a pothole (I should have seen) at a stop, and over I went (just to the guards). I was so angry I jerked the bike right back up (with only a small shoulder injury).

PS: I also think a good ride leader (of a group) should plan ahead a little and avoid such places.