Nuimari Arch at Heroes' Landing

I am here, and assuming the right place:

Forums suggest flying 'through' the arch, not beneath it.

I have flown over the top of it, I have spiralled my way down the centre of it, I have stood on both rotating rocks, run on them like treadmills as they rotate, I have stood on the little ledge near the smaller rotating rock, I have fallen down each gap either side of the large rotating rock, I have fallen down the gap between the smaller rotating rock and the arch wall.

The Korean guide says 'The rocks at the top are right, but hold for a while to find the exact point on that rock', but I'm not sure what I'm missing :/

Any help?