On the first runs, dust really seemed to be an issue for the cars in the left hand (outside) lane, if the car on the inside line hit the corner first.
The Super Specials at WRC events feature a cross-over so both drivers get to drive the same pieces of road (in a slightly different order).
The truth is that the drivers don't really see them as competitive stages (except perhaps bragging rights...) and you can only really lose an event on a super special (as Seamus Burke found out), and not win it by gaining a bunch of time.
So some of the stuffs (ignoring the track issues) were from people probably just pushing too hard.
For the 4:45 session they had indeed graded the top off the jump.