I guess you could buff everyone but Ryu, Chun Li, and Nash. Mika, you could buff her normals and then take away one of her mixup options (increase pushback on st.mp, decrease st.lk range, or something). Zangief seems like he needs something big to change to make him viable. Snake Eyez getting bounced by a random Vega in tourney? Lol. I think Zangief's problem is more fundamental to the game. Every character is good close-up now, with meaties being so powerful and such an integral part of the game. So Zangief is no longer particularly better than the rest of the cast at point-blank range.
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