I'm lining up with the larger rail that is at the edge of the flat part, aim at the intersection between the small rail and the angled section of the tree. Run forward and as I contact the slope, jump (with L held) forward and hold forward the whole time. Should I be jumping diagonally away from the tree from the slope? I did it once by getting closer to the tree and jumping more towards the lower section of the root and around the end.
Your Mainbar: