During loss streaks, I was gradually playing worse because it was getting in my head, where it just seemed that you were playing way faster than I could think, and everything I tried would fail.
On that note, I do think Yamcha is pretty underwhelming overall in a lot of ways, but the meter burn wolf fang is the best whiff punisher in the game by a country mile and really good at creating hesitation. That is the single tool that keeps him relevant, imo, and the one most prone to getting into someone's head. Being able to whiff punish anything short of a jab from 80% screen distance into a full combo is something wholly unique to him, I think, and having to keep it in mind for anything you throw out in neutral can really weigh on your mental stack and make you play slower trying to compensate for the possibility of it.
Yamcha is just so annoying, but I think that plays into just how bad at defense I am. With Yamcha, a lot of it has to do with staying still and reacting to then get out of pressure. So I try that, but the impatience rises dramatically anytime I'm forced into those situations, and this is exacerbated when he gets sliding KDs off of everything. Gonna get better at that.
Playing Yamcha against you is simultaneously fascinating and stressful because I can tell you're just like "I don't want to deal with this, I'm just going to vanish/up back and if I get out I get out" whenever I get the WFF in, and that beats almost all of his options that do major damage. So I resort to the delayed M second hit to catch those, and it works, but that's such a horrid starter it never breaks more than 2K damage even with a meter, so I constantly have to weigh the odds of going for the home run and
probably not connecting vs. going for the sure single when I'm already down 5 runs. Fascinating and stressful lol.
For super dashes, I actually need to learn to abuse them more. It's hard because this game's training mode is pretty ass, but I need to learn the best options to do after a blocked super dash in different situations so that I can keep the pressure on. I do it way too much though, running into stuff I shouldn't like Tien's beam or Yamcha's fang stuff, but I do like using it liberally combined with assists to cover multiple parts of the screen at once and secure a quick approach. I like alternating between doing that and pure zoning using 21's options and assists as well; I just need to get better at baiting super dashes for the 2H.
Honestly I thought your 2Hs were pretty damn solid too. There was more than one case where you presented a facade of being, if not unsafe, negative enough that I could begin my approach, and damn near every single time I got launched to the moon. That's a recurring theme of your neutral, I noticed. You space well enough and play
just passively enough to make it seem as though there are gaps that can be pushed through, and then I end up hanging myself because I horribly misjudged the situation. I don't really have anything to offer in regards to reinforcing that because, as you noticed, it kind of kicked my ass, it's just something I noticed in regards to your playstyle.
And yeah, one of the reasons I think scramble situations are so insane in this game is that there's simply no way to manually set them up yourself and practice them. Training mode is one of many things in this game that needs a second look but probably isn't a big enough priority to warrant it, sadly.