I wouldn't add any more cya yet. You just added it yesterday if I am reading your post above correctly. It will take about a week for it to dissolve so if you add more now, you may overshoot your target. Wait awhile until you retest cya so you don't waste your reagents.

Go ahead and add a bit more acid at a time to get the pH down to 7.2. Closely monitor the pH and if you accidentally take it too low, just add some Borax.

The reason we want to see a CC reading is to help us see if something is brewing in the water. Often, before you can see anything green or cloudy, you'll have a CC reading and that is a red flag to alert you to step up the chlorine. That is why Carl asked for it.

Sounds like you are doing well learning how to handle the pool. Good job and keep us posted how things are going.

Oh --- one more thing --- the white paper behind the tester is a good idea. Hope this helps!