I have a consistent strategy which has got me up to 40s a few times. Unfortunately my strategy against round 44 Mika isn’t sound yet.
EDIT: I’ve beaten hard survival!
There are various things you want to apply, depending on the character you’re fighting:
Most will fall for you repeatedly cancelling 2MP into H Clap. Sometimes you can get into a sequence where the opponent always does something that gets stuffed by the Clap. If the opponent blocks the Clap. Keep blocking and wait your turn. Some characters may punish you on block but just keep going with it.
Use V-Reversals whenever you can to regain momentum in your favour.
Ryu, Cammy, Chun-Li (might jab you out) will fall for 2LP, 2MP xx Overhead. Do not cancel into the overhead if the opponent is already standing. Usually if the opponent is crouching, they will stay crouching.
Zangief is like the first strategy, but add in a neutral jump 8MK. Zangief doesn’t seem to know what to do when you neutral jump.
I initially had an issue fighting Birdie at 43. If you do any combo into L Bolt, press 5LP, then go for a crossup it’ll usually hit. BnB into L Bolt and repeat. Also works on the Later Birdie
Nash, Mika, Dhalsim and F.A.N.G you just need to get in their face and press 5MK repeatedly. I don’t think Nash ever hit me. Mika you’ll trade with occasionally but you can go straight back into it. Dhalsim and F.A.N.G might beat you out of it from time to time.
Laura is the only character I haven’t nailed a consistent strategy with yet, but if you do mess up she doesn’t stomp on you too hard due to combos not having that high of a damage output.
I usually don’t use meter in these matches unless it would result in a KO. A lot of matches I’ll start with full bar and will use EX Clap to get in initially.