A match to analyze helps for giving tips. For what you mentioned, though:
1. There are only two wake-up options available to the opponent after landing Wingless Airplane: normal recovery or delayed recovery. They can't recover backwards after WA; the same as any throw or command grab in the game. If you're missing a meaty, it's simply that you're missing the meaty timing. Dash > st.MP after landing WA will hit the opponent in the air and simply reset them if they reversal backdash. The go-to meaty would be st.LK or st.LP, which beats it cleanly. st.MP does work against a wake-up 3f, though, if you call that out. Same for a Dash > command grab.
Never use st.HP as a meaty. It is -6, and there is no good hit confirm from it.
2. Well, can't say much about this one except for seeing the situations you're in myself. If you get punished by trying a dash command grab every time, then you're not properly gauging situations. This option is used when the opponent is very much on guard, because you've managed to scare them enough by properly applying footsies, and also being patient enough that they wouldn't expect it at that moment. You can't just always go for a cross-up j.LK at a certain distance; sometimes you should just walk and throw out st.MK at good distances and moments where it'll hit them or where they'll block it but won't leave you on too much of a defensive. Throwing out uncharged HK is also a footsie tool that will avoid lows and can CC.
3. The
most important things to know when playing Mika:
- Patience is essential. She doesn't have the tools or the properties (e.g. health) to get away with being impatient anymore.
- st.MP linking into EX Peach as a footsie tool. You have something like 4 frames to confirm this so it's relatively easy, and it's extremely important for damage, corner carry and pressure.
- st.MP > HP Peach buffer. st.MP is the main footsie tool because it has decent range for her and good recovery so it's hard to whiff punish. You have to empty cancel into HP Peach at neutral when you throw it out, in case it hits so it can cancel into it.
There's a bunch else, of course, but those 3 are essential.
My Mika is Level 74. Like I've said before, I play several characters; that header doesn't really matter. My Balrog is level 60-something, my Guile is level 50-something, my Birdie is almost level 40, and even Laura and Nash are level 30. My player level is 558.