You pretty much nailed it with poor decision making, which honestly just comes from lack of match-up knowledge. I’ll try and help as best as I can, though I’m not a Chun player so if I’m wrong about something, hopefully Ryan can come in and save the day.
Chun VS Yun.
First thing I’m noticing, which has been mentioned; stop jumping! Remember that you’re really catching a break vs Yun because his dash sucks, he cant dash under your jumps and punish you, but a good Yun will react and jump f-lp*hp, and then you’re in a 50/50 which is bad.
You’re trying to parry dive kicks too much, if you’re opponent is doing it all day, just cr.RH them, it beats them clean. (You tried to do it a few times, he was already too close; so he dived on top of it.) If he is too close you need to try neutral RH or jump away and reset your spacing. Oh, and it’s not bad to parry them, its just not always ideal because they can time them differently making it difficult. Cr.RH is a safe way to stop them.
After your SA2, you follow up with jump LK, this is mostly used as a 50/50; will you go under them or stay on the same side? You weren’t really taking advantage of this and stayed on the same side every time. You also did LL or cr.mk LL after every reset, if you aren’t making him scared of throws or overheads, he’ll just block every time, no problem, so mix it up, put that fear in him.
Watching Ken vs Chun now.
First thing I’m noticing is your whiffing back fierce and forward fierce, super easy punishes for a shoto. You really have no need to initiate offense because all your pokes destroy Ken’s.
You have him scared of your pokes, allot of times he would just chill and wait, these are the times you need to take advantage of your mk kara throw.
Too much cr.jab, you do it when he either gets too close or on wake up, someone that catches on quick will bait that shit till you stop, and when you’re scared to crouch tech, things get ugly. On a side note, cr.jab isn’t bad, its a great button with Chun, but from what I’ve seen so far, when you aren’t using it on wake up, you’re just hitting cr.jab and walking up for a throw, once he gets used to that idea, you should start doing cr.jab lowforward or kara throw, etc.
With your normal moves, you’re doing great but when you’re playing footsies, you start using them preemptively, which isn’t bad but it is when you’re whiffing far st.RH and forward fierce, both very punishable moves. If you’re scared of him dashing, stick to lowforward and st.strong, you don’t want him taking advantage of the fact that you’re worried about dashes. Use your other pokes reactively, if he whiffs lowforward, foward fierce him or if you have meter lowforward super him, once you get your ranges down you wont be afraid of forward fierce, but right now you’re missing it allot. You’re using far st.RH pretty well, on occasion you’ll use it a bit too close. I don’t know if you are, but everytime you do far st.rh buffer qcf 2 for the confirm if you hit him crouched.
Jump fierce fierce, use it reactively, not preemptively, he just shoryu’d you for guessing he’d jump.
On his jumps- you can dash under, st.jab, parry OS RH/JUMP, or simply jump away. If you’re feeling sick, react air throw (feels so dope haha) But yeah, where I’m at, hes taking advantage of the fact that you aren’t doing much to stop his jumps, which takes away one of the reasons Chun is a bitch, dat wall.
alright, this is too long and I’m pretty drunk but good shit, you’re going to be sick. #1 advice is just watch more videos and play better people.
oh and you asked what you should be focusing on more: using your normals reactively, choosing better buttons to use in certain situations, putting in a better throw game; nothing is scarier than fighting a chun who’s good at baiting throws. Make sure you’re spotting crouch teching, once you punish them for that they’re forced to guess or just chill, which gives you free throw mixup.