This'll sound like a scrub-answer, but bear with me. I'd ask who do you use first or your usual strategies, but as a general suggestion, I'd say keep using the weak attacks consistently, like standing or crouching A/B, and if you know certain combos with characters (example - Terry's cr.A, cr.A, cr.C, qcb.A), complete only what's needed to keep the pressure in that combo (cr.A, cr.A, cr.C) several times if possible.
If you are using the same tactics a lot, it will get predicable, especially for human opponents. Change it up and use like a vertical short hop (tapping up lightly for a low jump) with a heavy P or K.
If you're up against grapplers, be aware that sometimes that's playing right into their hands. I've eaten many Clark grabs by trying to lock him down in a corner, stupidly forgetting the armor.