That's the thing, though. In general I find Ibuki's U1 way more useful for me than U2. Ignoring the fact that I can't SJC (though not for a lack of practice), U1 is better for almost every matchup. The only characters I ever automatically choose U2 for are Honda (U2 can punish a blocked non-EX Headbutt) and Dictator (blocked/whiffed Devil's Reverse, whiffed Headstomp and I think blocked Headstomp followup, I forget).
And yeah, I know the matchup with Seth is in my favor. I need way more practice. I was watching an Ibuki tutorial a couple of days ago, and I was marveling at how she can stun any character with two specific target combos in a row. Absolutely mind blowing.