I'm amending one point in my missive above, though I followed TFP guidelines for adding muriatic acid (MA)
Recommended Pool Chemicals - Trouble Free Pool, I could still see a "cloud" skim across the top of the pool water even with dipping the MA bottle into the pool before pouring. As someone with a healthy respect for chemical additives and reactions when it comes to using them around environments that include people/pets (who I made sure were out of the pool area anyway), I bought some dry acid which for me now has been less stressful to work with and seems to do the trick for lowering pH (and not having to store a bottle of MA sealed in a plastic bag). I'm assuming the liquids mix more quickly with the water than the dry materials, so pre-dissolving the dry acid in a bucket of water (as suggested in Pool School) maybe helps out with quicker distribution in the water? I wait a couple of hours after adding a chemical(s) before swimming regardless. I guess it's "whatever floats your boat" when choosing one acid-adding method (liquid/dry) over the other - though I've read that MA reaches its potential in the pool in 3 to 4 hours, whereas sodium bisulfate (dry acid) takes at least 24 hours to reach its potential.