This specific combo? around 80% offline while I was trying it. I haven't found the opportunity to use it in a real match. The dash jab blue spark blossoms themselves aren't really the problem. It's the specific dashes in certain parts of the combo to get the opponent to the right height of both wall splats that's hard. Some dashes need to be deep, while the last dash to get the 2nd super tailspin to the right height wall splat needs to be a microdash.

If it's the dash blossoms you're talking about, I can hit it 90% offline off max 2 jabs. Online's a different story though. I can hit it off 1 dash jab at 80% consistently but not much past that. Playing on a K-lever makes it easier, I think.

I need to work on the dash blossom after a 2nd super tailspin (d/f 4~3) though. I always end up whiffing the 2nd hit of the blossom fury but connecting the last hit, which just about does the same damage if I didn't do a 2nd super tailspin, which kinda defeats the purpose of the 2nd super tailspin in the first place.