I've never seen the reflecting thing before, although I don't use it to intercept projectiles, so that would probably be a good reason why... I didn't even know you could use it to reflect them, although I did know it could block some (like arrows).
About cancelling the short hop down+A, I'm afraid there's no way to actually do it unless you use the ledge trick. If you get to a ledge (whether it be to the stage, or just a little platform) and land on the very edge and hold the direction that would have you fall off, you will land without stabbing into the ground and slide off the edge. Although, it's not very practical and can be VERY dangerous to use (since you might be at the edge of the stage, an opponent may CC it and smash you away while you're slipping off the edge of the stage). Another thing is if you hit with the aerial down+A, it will sometimes auto cancel for you (without even stabbing into the ground) although you all probably knew that. So the lesson is, always hit the opponent with it, and you'll have a pretty good chance of auto cancelling it . I think pressing L/R can also help auto cancelling if you haven't been in the air long enough, I know jump can interrupt moves (try it with an aerial attack with, use a normal mid air jump, and then use his up+B with the same aerial attack and see which one you recover from first). Well, I guess that's all I have to say for now. Good luck on your discovery Kubuu, I'd like to hear more details when possible.
About cancelling the short hop down+A, I'm afraid there's no way to actually do it unless you use the ledge trick. If you get to a ledge (whether it be to the stage, or just a little platform) and land on the very edge and hold the direction that would have you fall off, you will land without stabbing into the ground and slide off the edge. Although, it's not very practical and can be VERY dangerous to use (since you might be at the edge of the stage, an opponent may CC it and smash you away while you're slipping off the edge of the stage). Another thing is if you hit with the aerial down+A, it will sometimes auto cancel for you (without even stabbing into the ground) although you all probably knew that. So the lesson is, always hit the opponent with it, and you'll have a pretty good chance of auto cancelling it . I think pressing L/R can also help auto cancelling if you haven't been in the air long enough, I know jump can interrupt moves (try it with an aerial attack with, use a normal mid air jump, and then use his up+B with the same aerial attack and see which one you recover from first). Well, I guess that's all I have to say for now. Good luck on your discovery Kubuu, I'd like to hear more details when possible.