PurpleNebula | Beach Bowl S No Ice updated (TAS) @purplenebula8003 | Uploaded 3 years ago | Updated 47 seconds ago
with the allocation and the understanding of the lack of understanding

from what I've tested over several different tests in the past year or so, by jumping into water so the camera zooms in, and then getting out and also jumping up a bit, the camera will adjust itself just right to get a huge megasideflip at the start.
Also this one has to have the mid-air angle sit outside the y-axis' central deadzone by no more than 3 joystick values i.e. with the deadzone being 113-143, y can only be 110, 111, 112, 144, 145, or 146.

also, I learned from this testing session that for the second megasideflip, the camera is affected by where you grab the ledge beforehand, and possibly also the time you jump out of the grab.
At first I struggled to get a good megasideflip like I have in previous videos, but I tried to grab the same part of the ledge as a previous video and got better height from the same position and angle as the failed attempts. So there's definitely something there.
I also switched from right to left during the megasideflip to increase the height even further. This was enough to 2P mid-air to skip the sling star.
The angle for this one can be within the deadzone, but I also found that using those same values just outside the deadzone can slightly affect the height gain, possibly because they go slightly forward or backward.

What looks like a 2P wallkick is a regular mid-air from a spin cancel ground pound after wallkicking. I started Nunchuk shaking before wallkicking to get an earlier spin.

Surface spin probably isn't faster but it's fast.