Correctly pulling off 'Koushinhi Fusshu' ?

Koushinhi Fusshu (,)

I saw a vid of LA pulling this move off after doing an offensive evade. It grants a +20 on hit.

I've been having trouble getting it to land properly and consistently in the dojo. Does anybody use this move, or have any advice on ways to pull it off successfully?

 

I tried it several times on ranked matches, but I can't get a single one. Can be useful against a throw, but who knows.

 

Opponent's back against near the wall -> 66K wall combo time.

Not many tips for actually connecting it, may be easiest after SOU P+K P or 214P+K frame traps near the wall. Gonna check.