For the second part (cabling in the cave), you should enter it by jumping from the side of the hill. 63k is definitely possible without doing this, but its pure luck. This jump offers a more consistent way to convert your runs up by 1k - so your 61k PB would become 62k, and a 62k run would become 63k. This is how I got 64k...
Let me know if this was helpful at all, or if I was talking about the complete wrong section.
EDIT: I guess not cabling right at the end counts as a shortcut, I guess you already figured that out though...
Let me know if this was helpful at all, or if I was talking about the complete wrong section.
EDIT: I guess not cabling right at the end counts as a shortcut, I guess you already figured that out though...