A CC reading of 0.4 is ok but if it goes higher than 0.5, you'll want to shock the pool.
When adding Borax, generally a couple of hours is enough for it to get mixed in well. Testing it again in the a.m. will be fine.
I do not know what trichlor tabs with zinc sulfate monohydrate are. I'll run it past Ben. But, definitely don't use the ones with copper.
Sounds like you are doing fine.

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