Bison can be tough if you’re playing a good, patient Bison, but I think it get pretty rough for him if you get a knockdown. Also, EX Tatsu beats wakeup EX Psycho.
Gouken I always thought was kinda free, just don’t get hit by his punish combos, ever. Once you get the knockdown, the match should be over. His wakeup defense isn’t that good without EX Tatsu.
Fei Long is pretty tough, but I think it gets evened out by Evil’s damage potential compared to his. I think you can lame him out a bit too. Chicken Wing is something you can react to, and you can neutral jump him if he gets predictable with Rekka. Still, this is one of the hardest matchups.
Vega I would say is similar to Bison in that the player has to be patient, but he can really outfootsie you. He doesn’t have great AA though (except possibly air throw and NK HK). Well-timed jump-ins can lead to a match in your favor easily, and I think this makes Vega winnable. Oh, and be prepared to punish backflips if you’re playing online warrior Vega. 
Otherwise, I think Akuma is tough as well, simply because he has more options (notably Zankuu Hadouken). I’d say hit and run here. You can keep up in the zoning game well enough to sustain your life lead if you have one. However, AFAIK Evil Ryu doesn’t have a good way of dealing with teleports apart from hard reads. Also, use Ultra II to punish neutral jump air fireball. A smart Akuma won’t allow this, but you can at least give him pause to throw out air fireball.
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Vs. Bison. You can throw him out of EX crusher. You can do this vs. a ton of moves, if you get a good read on when they’re going to use them. Learn the timing for them and you seriously mindfuck the opponent. Vs. Bison it’s great because it will force him to do wakeup headstomp, devils reverse, teleport, or like c.lk crouch tech. Only headstomp and the crouch tech will beat your throw. Headstomp will punish your throw whiff. C.lk will become active before you’re throw(Think you have to throw him on the fifth frame of startup and c.lk is 4 frames).
Vs. Fei long, learn how to use lvl one focus vs. his rekkas. Focus the first rekka and release right away. If he does the second, which they will if you let them abuse it, he’ll get counter hit and crumpled. Make sure you’re watching, though. You don’t want to dash in unless you hit them. If he doesn’t do the second rekka, backdash to cancel the focus after he blocks it.
Fuck Vega. I hate him. If you can’t knock him down, you’ll probably lose. You gotta work him to the corner. You don’t have a great answer for his pokes because he’s got to much range and you’re attacks are to slow to really whiff punish him.
With Akuma, yea, this match kinda sucks, too. Be careful with c.mk. He’ll try and walk back out of range and punish you big with his s.hk combos. If you have reactions, it’s easier to punish jump back fireball with metsu hado now. You can OS his teleport with hk tatsu.