I think that me n the Harris are in agreement that if you can pull on with foot on the back, do the 1st move and place right heel on while left foot is still on the back, then the problem is easier. Mainly because you can see where your placing your heel, with the campus way you often put the heel on wrong, but you dont realise this until you've done a further 2 moves, quite frustrating.
Anyway if my legs were long enough I would use the left foot on the shelf method, cause its more percentage.
Top problem, good luck.