I don't know about the things that I do wrong, personally
when we played the other day and it got serious, I started nairing you a lot more; I think this worked well because you were used to playing an approach-based game vs fox
playing mango's sheik, he just has a lot more presence. he knows how to keep me under his control and read my options and stay in my face, making sure that I don't move really (or if I try to run away he punishes me).
camping vs fox doesn't seem very effective, at least compared with this alternative
also I got good at not choking, so now when I'm playing under pressure my execution goes through the roof because I can calm down my chest and my hands, while still keeping that focus on the game and on tech skill
maybe that threw you off after playing me sloppy in the friendlier friendlies
I guess the things I do WRONG are like, sometimes it's better to go for bairs instead of upairs so I can try to push you out over the stage out of grab combos
I used to be really really stubborn about grab/cc/dodge battles with sheik, especially from playing steven a lot, that was like my biggest problem
other than that the biggest thing I can think of is not pressuring sheik enough, or in the right ways. usually I'm content to run in, hit one or two nairs, then back off again, and place all the weight on my grabs
I'll be glad to talk about this when everything's fresher on my mind, like in person or on sunday or whatever, we could do mms maybe