I can't even get Juste's higher-than-normal backwards jump to work.
You know, the one where you jump after backdashing off of a platform? That one.
I know I'm not much help, but at least I feel your pain!

Thanks for replying!
Do you mean this one in the attachment?
This one I might be able to help a little because I am relatively confident of this one.
Take when you're facing right for example: hold right and jump to the exact edge of a platform, when you land walk to the right of the platform by not letting go of the right direction for like one imperceptablly brief moment, the do [releasing right, backdashing out of the platform] in one smooth sequence and it should be able to work.
I know mine is not the only (and probably not even the best) way to do this, but it always has had a decent success rate on me, so I hope it might be of help to you as well

And as for the dvkic glitch, I resorted to Niconico videos after posting the thread and found out the answer to my question is one frame

Guess it really is hard to be performed in non-TAS environments
