Seem to be using A LOT of chlorine

Good.

I assume your CYA test above is a recent test. I would suggest you raise the CYA to 80 ppm when you start the SWCG.

We do lose CYA in our pools in June, July, and August due to extreme sun. I lose up to 15 ppm CYA a month. So be aware your CYA can drop some. But sounds like you have a high natural consumption of chlorine. It should go down with a higher CYA.

Be aware of degraded liquid chlorine. The heat here can effect it rapidly if it is stored outside. Source product that is either extremely fresh or stored inside.
 
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