This seems a reasonable place to ask this; I'm playing on the Vita, and going after the final piece of the puzzle.
This would be the bottom-right piece, and the two-screen jump in 46,28/46,29.
I see how the jump is meant to work, and I've attempted it several times, but I consistently come up a few pixels short of the ledge. Two separate guide videos have shown it being cleared with a huge margin, starting apparently less altitude than I've managed.
Is there something special about dropping from the exact spot in the left-hand channel, or am I just terrible, or is something wrong here?