I like that you are trying to incorporate advanced movement techniques in your play. That is critical to Ein. Ein is best hovering at about midrange where he is out of range from jabs and mids such as a characters 3K but not so far away that he cannot hit a 46P or a 236P if the opponent whiffs something. During spacing you want to watch your opponents movements and habits. If they indicate to you that all they like doing is moving back and forth dash in and grab or approach them with strikes. You have to make them feel uncomfortable as that is when they will do something stupid that you can capitalize on.
The Ayane in the first vid is a prime example. You know Ayane is going to try and approach you with 66KK so watch for that move. And I mean both kicks because if you try to whiff punish when you see 66K you will get hit by the second kick. Always try to punish between the second and third kick with 236P or 46P if it can be used. 46P is best used on moves with long recovery that leave people standing or when people are rushing you with strings a good distance away. 236P should only be used when you know you are scoring a hit off of it for example on whiffed wakeup kicks or lows from distance.
When Ayane rolls at you use 4K. That will put her in the air and teach her a lesson. In the second vid you should have went for 46P or 236P when you saw Ayane whiff 4P. Waiting to see if she finished wasn't a bad idea though. In that situation if you feel you were too slow to get a whiff punish go for 46K or 236K to close the gap and get frame advantage. 1K wasn't a bad choice at all just those would have been a bit more effective IMO. You were also staying at fullscreen which I can understand why I against Ayane but in the end its not effective. You always want to be outside of strike range but inside of whiff punish range should someone try to come at you with strikes or gap closers.
Video 3 if you are going to rush in at the range you did make sure you commit to something. If you rush in and guard stay guarding to avoid being counter blown if your opponent decided not to strike you with a keep-out move for rushing in. Never forget that Ein isn't all about spacing and whiff punishment; It is just his strongsuit. There will be times you have to approach your opponent to initiate your offense. Get used to using 1K, 66P, wave dashing, or just running in to start your offense. If you give your opponent a reason to want to keep you out when you are at range that makes it easier for Ein to do serious damage during footsies.
Other than that your Ein is nice. Solid juggles and setups. Keep working at it and you'll be fine. I'm in the same boat as you so it will be cool once we become adept at wrecking people in footsies.