That long airdash is pretty scummy as a mixup. Keep someone sitting there with an assist and IAD delay j.C/IAD j.[C](whiff) 2A is hard to block, especially if the assist covers Yuuki visually a little.
For 22, it's the height when you airdash and hit the first button. Try jumping straight up and timing the airdash on the way down to make it easier.
100 damage without meter, it's probably easiest with a Dust combo. 5D j.D j.D j.S j.P j.S djc dj.S dj.P dj.S dj.H dj.D. Other ways of doing big damage meterless are with a grenade set up or against specific characters who can be comboed meterless after 2D.
Get the first hit and it's a win. Her only real way out is Blitz Shield. You can dash under her 5H. Don't jump into a grenade. Don't even let her get it out, actually. Run that shit down. El has the advantage of solid pokes, but she can't compete in terms of movement. If you don't give her the space to set up shop, she's not getting married.