You were correct earlier in the thread about not being able to test PH at High Chlorine levels FYI.
I would wait to deal with any borates addition for at least a month after you are swimming.
Have you read about adding DE to help your sand filter clear up a cloudy pool? pool-school/add_de_to_a_sand_filter
I understand you have to monitor your filters pressure regularly after you add it, but you can always backwash and get rid of it.
Keep at it you are almost there.
I would wait to deal with any borates addition for at least a month after you are swimming.
Have you read about adding DE to help your sand filter clear up a cloudy pool? pool-school/add_de_to_a_sand_filter
I understand you have to monitor your filters pressure regularly after you add it, but you can always backwash and get rid of it.
Keep at it you are almost there.