most applicable crouch cancels:
run the **** away after crouch cancelling
then its grab, although superb fox spacing will not get grabbed it works often enough to try it
don't think down-tilt works well but if it works for you then ****
==
are you talking about waveland off the stage to up-air? because that is an incredibly powerful edgeguard tool that a lot of people don't expect and always seems to hit (especially (weak) knee)
go to 2:30
http://www.youtube.com/watch?v=5qgfgHF1-Cc
although it didn't hit, i still **** brix at the fact that isai did this 6 years ago, great tool to implement for edgeguarding (for spacies you should face forward and weak knee)