Sounds like you're almost there. You'll know for sure when the Cl stops dropping overnight, when tested in the evening and again in the morning before the sun hits the pool. Just a note--I'm one of those that keeps my CYA intentionally 80-90 because I live in Louisiana with my pool in full sun all day. If I keep my CYA below 60, I lose almost twice as much chlorine during the day as I do with my CYA at 80. It's an unusual case, I know, but I'm just saying it happens.........

Janet