These are the combos I use after command grabs in the corner:
L version: B, S, j.C, fly, j.A, j.C, unfly, j.B, double jump, j.B, j.C, j.S, land, L rocket punch. 451,700.
M version: j.A, j.B, j.C, land, j.A, j.B, j.S, land, B, S, j.C fly, j.A, j.B, j.C, j.S, land, L rocket punch. 475,400.
H version: j.B, j.B, double jump, j.B, j.C, j.S, land, S, j.C, fly, j.A, j.B, j.C, j.S land, L rocket punch. 519,300.
Midscreen after H version(thanks GcYoshi13!): fly, move down forwards, j.L rocket punch xx hard drive, land, cr.B, S, j.B, j.B, j.C, j.S, land, rocket punch. 528,500.
Dumb things about command grab people already know:
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can be kara’d with 5C for massive range, can be used in a tick throw setup with 5A providing it isn’t pushblocked. If you do 5C at close range and they block it, if you delay your timing you can do a command grab afterwards (risky).
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j.A has very little blockstun so if you do that on the way down you can do a command grab afterwards. Common flight corner pressure is fly, j.B, unfly, j.B/j.C, but if you delay that last j.B/j.C it’ll whiff and set you up for a command grab. Obviously every j.C should be inputted as j.6C so you option select air throw.
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if you press S while in flight obviously it grounds you, but if you do it low enough to the ground it whiffs, allowing you to fake an S and go for a quick ground move instead, often a command grab. If you go into flight from the ground you are at the correct height for an S to hit but if you TK flight, your S will whiff.
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you can obviously get dumb mixups with x factor into command grab like point blank HSF, x factor, command grab (inefficient as hell but fun to do and if they jump you can get a free air throw attempt or another option selected HSF for big chip.
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use of the bomb drones can lock your opponent down as they stay out no matter what, which can lead to interesting setups.
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experiment with assists (obvious). Guys like Goukifafa get great setups and pressure off akuma tatsu.
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if you are flying and pressuring in the corner and they advance guard, if you unfly at the perfect time you won’t get knocked back and will be right in front of them for whatever mixup you want.
If any of this is too dumb let me know and I’ll edit it.
EDIT: Remembered another setup that EVERYONE falls for the first time you do it. If for whatever reason you don’t finish someone off with a Sentinel corner combo, and you know they’ll tech roll out, back dash and do the H command grab.