Have you done an OCLT? The loss over 24h does sound a bit much, but without confirmation that you actually reached 16ppm it's hard to tell how much you actually lost to potential algae. The AA seems to be neutralized again.
Your CYA test was 45, if I remember correctly? Generally round up to the next 10 for the purpose of determining FC values, do SLAM would be 20. But I'd still prefer avoid going there that short after the AA treatment.
I'd suggest to do a proper OCLT. Dose up to 16ppm after sunset, confirm the FC level after 30 min with the pump running. Then test again in the morning before sunrise after having the pump run for at least 30min (you can let the pump run over night to avoid having to get up even earlier). If the loss is more than 1ppm you'll definitely have to SLALM.
If you pass the OCLT, but the water is still cloudy,, You should also SLAM.
In your case after the AA I'd suggest to go a bit gentler, and maybe only go half way up to SLAM. Clearing will take longer, but the risk of the stains returning will be smaller. Looks like you have been able to go up to 16 without stains returning, do that might be be a good compromise for now. Maybe don't go up to the real SLAM of 20, not just because of FC, also because of pH, that goes temporarily up when adding that much Chlorine (it goes down again as the chlorine is used up). It's the combination of high FC and high pH that is most critical for stains.
Make sure that your pH doesn't get too high. Anytime you're under FC 10, check pH. Before dosing up to 16, bring pH down to 7.2.
Check TA also, it will drop when adding acid frequently. Don't let it fall below 50, but don't add baking soda sooner. Then bring it back to 80 or so.
Let's hope that the stains don't return while getting the pool back in shape.
