Really, I don't remember the walls between 4-6 being anything that I was concerned with last week, probably because I was either going too damn slow, or because I don't look that way. Since I missed the PPIR round last year, I can't say if they were the same or not.
I hope someone who was there last year will draw a diagram of where the walls were because I certainly don't remember them last week being close outside turn 4 like the google earth picture shows.