Your CYA is fine. Dichlor would raise it up more, so I wouldn't think it would be wise to use it any more.

Keep to your schedule of testing morning and night, and add what you need to with bleach/chlorine to keep it within range on the Best Guess Chart.

If the low FC problem persists, start brushing your pool daily, and raise your FC to shock level until it loses <1ppm overnight.

I'm guessing that you may be nipping an algae bloom.