I hope you don't repeat it 7 times before succeed in real match x) (just joking dude)
I still prefer my 2, up slash starter as an AA (I prefer good stuffs I will never drop for some reason and I also like finishing combos by reset, mine is 29% reset followed by +10% string on block : 2, up slash, 2, 3, red dash, up slash, 1, 1, 2, ex-dag cancel, 2, 1, 2+1, red dash or dag cancel etc...).
What about U3 hitbox ? Is it good against a jump kick ?
One thing, I really dunno why you don't air dag on your second U3 (add +1% to your combo) and don't red dash right after your 2, 3 for the up slash, it makes the string easier to do coz you're closer from your opponent for the f4, 3. Also, this air dag + red dash added to your combo will give you a bit of meter.
So it should be this : U3, U3 air dag, 2, 3, red dash, up slash, f4, 3 : 41% + some meter, easier to do coz without the dag, the 2, 3 is very hard to get on timing because your opponent is too close from the ground and will drop too fast, and without red dash it's very hard to get the f4, 3.
Try it and tell me bout it.
Yeah, but seriously this F4 is a pain in da ass ! My Skarlet always does
4 or
f4, 3 instead and even (sometimes)
f4, tp (don't ask me why lol) when I try that stuff followed by a red dash