When you did j2C whiff->5C against Japa in the corner, was it because you knew he would backdash or was it an accident?
236D oki isn't good against Rachel due to her wind tech.
You should 2D Rachel more so she doesn't summon stuff in the air.
Air throw->5C whiff->4B against their neutral tech looks nice
I think you do 3C->something that isn't 236B too much. 214D or 236D are punishable after it and 236A is only okay if you don't overuse it.
While optimizing is important, you should put some more time into hit-confirming. It didn't seem like you ever really hitconfirmed landing 5DD and had already chosen what you were going to do after it, regardless of whether or not your opponent got hit by it. Same thing with landing 236D.
I also think you use 5C way too much in both pressure, neutral and for oki.