Don't worry too much about being off on the CYA test. The whole thing is a range, anyway. You're good between 30 and 50 ppm. You're marginally okay even at 70 ppm but you would be using more bleach. Sounds like your water tested right in the middle of the range so you can switch to straight bleach now and not use the pucks anymore.

Those tests will become second nature in a few days. Do the pH and the 10 ml FC/CC test daily and check your alkalinity once a week. If your pH stays steady your TA (alk) is probably okay as well.