the algaecide you used possibly had ammonia, and CYA decomposed to ammonia. Result is high startup demand of chlorine.
Keep adding bleach as Watermom said- your CYA of 20 means 12 chlorine, so add what will give 12 in your pool, and test again in an hour. Keep testing/adding chlorine as often as you can (hourly if possible) until your FC holds overnight (<1 ppm drop from sunset to sunrise without adding anything), running filter 24/7
The cloud should clear as you get rid of ammonia- what the bleach doesn't take care of, the filter will over time.
The higher alk will also go away with time, if you aerate your pool. aeration will cause your pH to rise, add acid to lower it (to 7.2 or 7.0) when it rises above 7.6. The acid will neutralize the TA, and continued aeration will raise your pH again. At your current levels, I don't think this is your main problem, but will become a problem if they continue up!