Does the pool area smell like chlorine? If so, that's CC you're smelling. You're probably still killing off algae, the water isn't totally clear. The shock process can take more than a week - last summer there was some poor guy who worked hard for about three weeks before he finally passed all three tests.
But you must admit, your progress has been noticeable in just a couple days.
Stains won't disappear instantly; they didn't develop overnight, either. At the temperature you keep the pool, CSI goes up. I know, seems contrary to common sense - stuff usually dissolves in water faster if the water is warm, but that's what the pool calculator CSI box shows, and my personal experience confirms it. When the water is warm, my scale is steady, when it cools down, the scale starts dissolving. White powder could be calcium precipitate, or just dead, bleached-out algae. Once the shock process is over, try to keep pH towards the low end. If it's Calcium, it will dissolve into solution at a lower pH and the water will clear up. I have astronomical CH and yet I can drop a coin into the deep end and call heads or tails from the deck.