I still can't see the mixup. Do you mean her f43/f44? Because that's not a mixup. The opponent can crouch block/stand block both strings. Let's also forget about Kameos for now so we can understand each other.
Idk if instant air db4 is unreactable but it's not safe, it's -14 on block. The EX is -6 but it costs resource which is a major issue as a tool to check your opponent. I don't want to spend resource while on top of that using a difficult to execute move just to check my opponent for an overhead. In this case, f44 is much more preferable. Or even f3 tbh.
Yes, her pressure is strong. Although, I feel is a stretch calling stagger + throw a mixup. By this logic, aren't all throws a mixup of some sort?
Maybe her up close game could be toned down a bit, and in return she could get more mid stage tools. I mean, idk. In my experience, up close she can be quite oppressive but characters like JC obviously destroy her, as they should. Also not many people know how to play against her so I'm not sure yet about that.
It’s a 14 frame overhead. It’s definitely unreactable.
The ex one is safe. She has the tools, you just don’t like using them. That’s fine, but you can’t go on saying she’s doesn’t have mix when she has one of the best overheads in the game. It needing bar is fine because of what it does. Li Mei builds bar very easily anyways.
Johnny doesn’t destroy her up close. She has db3(ex) as a 7frame reversal and her armour is decent. She also has a decent d1 and can take her turn with s1.
Her hardest matchups are probably Ashrah and Reiko, but even those don’t feel too bad.
It honestly sounds like you’re looking at a really strong character with really good tools, and saying, “I don’t like the way she plays in this aspect” and therefore requesting she be changed. The reality is she’s incredibly strong with a great tool set. If you don’t like the way she plays or don’t like using certain tools, or want mixed hitlevels in strings, pick a Kameo to fix that, or pick another character.
Li Mei is fine as she is.