So your overnight loss is slowing down but to prevent loss during the day you need to get CYA in the water. You can either add pure CYA or can use Dichlor granulated chlorine to add both chlorine and CYA at the same time. Keep your FC level elevated to be around 40% of the CYA level until your overnight FC loss lowers to around 1 ppm or less.

Yes, you did well ignoring the phosphate remover. That would not have helped.

A reasonable target CYA is around 50 ppm in a pool exposed to sunlight. Some pools need more (but not more than 80 ppm) while some are OK with less.

To avoid the pool turning green over the winter and to lessen the chance of bacterial breakdown of CYA, you should close the pool as late as possible with the pool water cooler than 50ºF and at that time you can shock with chlorine and also add Polyquat 60 algaecide. Then in the spring you want to open the pool as early as possible before the water gets any warmer than 50ºF.