This might not be the right place to say this, but I can't up-B cancel at all. Is there any kind of "trick" to help me pull it off, regardless of OoS or not?
When it actually hits you seems to have more time equal to the amount of hitstun caused by the first hitbox. The cancel window also appears to be right after that first hit, so it's very possible to cancel too early if you beat the hitbox ( something that I did when first starting out and took a while to realize.) Using 1/2 or 1/4 time in training makes this obvious.
Inputs:
I'm able to do it 4 ways, #1 I find the easiest and #4 I find the most inconsistent -
1. Up-B angle backwards then quickly flick the analog stick in a direct line to the opposite side where you Up-B'ed (I usually do ~40 deg up-back then ~45 degrees down forward)
2. Up-B the direction you are facing then flick the analog stick in a direct line to the opposite side from where you Up-B. Basically the vice versa of the above.
3. Up -B at an angle in front, then quickly rotate the analog stick in the opposite direction you are facing until you reach down. So if facing left, after front Up- B quickly rotate clockwise until you reach between 3 to 6 o'clock.
4. Vice versa of 3 also works.
The key is to have the analog stick cross the threshold from front to "back" during the cancel window which is supposedly 1 frame (feels more lenient than that on hit). So the analog stick being registered in the opposite direction of where the Up-B initialized seems to trigger the cancel and allows the early landing.
I'd say it's one of the easier techs don't over-think it, and make sure your analog stick on your controller isn't the problem.