Calcium build up?

You don't need to keep FC that high.

For lowering TA, see the article on that in the How To section of Pool School.

Your approach on CYA is fine. Hang it in front of a return jet.

You can swim. You can swim as long as FC is between the minimum and shock level, you can clearly see the bottom of the pool, and there is no obvious visible algae.
 
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