For 360’s getting you out of the kunai mixups, they should only be able to Ex-spd you. More trouble than this in my experience is lariat. I havn’t tested it that much my self, but it seems to beat all kunai. Again I am only talking about what I have experienced in match play, maybe I wasn’t getting it meaty enough, but lariats hit the kunai even when its in his legs. Hawks dp should get baited like all the others as long as you are properly landing on his back side.
Dictator can’t really do anything besides ex-psycho crusher to get out of the vortex SAFELY. ex head stomp will just whiff infront of you and let you punish, so just make the most of any kd you get against him and go for the gold. Footsies against him are a crapshoot.
Chun can spinning bird kick.
Akuma can Teleport. You’re mistiming it if you’re getting dped.
Blanka up ball/Guile flash kick can hit you out of it on a cross up kunai if you miss timed by a frame or two and they reversal late in the window(which can be hard).
Abel can probably roll, and ex grab if timed right.
Guy is like chun.
Boxer can probably ex rush punch out, but thats it.
Gouken can counter, and this applies to every counter, you just have bait it out, and after you punish a counter you can try to mix him up next time, or try to bait again. Basically it is just a matter of being in your opponents head. If you don’t feel comfortable guessing, just safe jump os throw tech. Dudley’s counter has a good chance of sending him the wrong way.
Seth isn’t really more dangerous than any one else. I don’t know specifics about him, but if his ex-360 has invincibility, it can probably get you. Teleports.
I can’t think of anything else of the top of my head, but just try to understand how your mixup is working, and I think you can basically figure out what is going to be dangerous, and what isn’t. If you guys want I can throw this in the first post.