I am new to this forum and new to the bbb method . I have a 24 ft x 52 " above ground hard wall vinyl lined pool ... 15,000 gallons . here are my levels as of this morning

cc 5
ph 7.5
ta 110
cya 20
I will be ordering the taylor test kit this week so I can get more detailed readings. My question is do I need to raise my cya levels ? I am losing between 3 and 4 ppm a day of chlorine . I bring the chlorine up to 6 in the evenings just before sundown and by sundown the next day it is 2 or 3 . Also does anyone know of an easier test for cya ? The black dot test is hard for me to read , I'm not sure when it is correct . Thanks

Tessajade