If you don't claw, try setting a shoulder button that you dont use to jump so you can control your hover in all directions with all aerials (since i use R for shielding, wd'ing, etc, i set L to jump.) Then just hold down on control stick(only release after in hover) ->hold Jump ->use aerial (use c stick) -> let go of jump-> flick down (fast fall to ground for float cancel). With dair you'll have to float to the ground rather than fast fall if you want the hitboxes out so hold down (dont release) -> hold Jump ->dair -> hover into ground. Practice doing this with all aerials as fast as possible and use the first method for all of your aerials except dair. Side note: Hover cancelled nair doesnt have the final hitbox that knocks them away so know when it is better to hc nair rather than djc nair.