FC + CC = TC. Always. So, first you need to straighten out your chlorine readings. Your ph is fine at 7.8, but you don't want it any higher. Your alk is OK at 160 for a vinyl pool. Your cya is a little higher than I like, but OK at 65 if you maintain adequate chlorine levels as a result. See the "best guess" chart in the sticky at the top of the chlorine forum.
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