Ah, yes. That's why we try to keep threads to one original poster. I just jumped to the start for your gallons, and found the OPs gallons rather than yours. I should have moved your posts to their own thread, but have done so, now.
1. As you thought, instead of dosing for 5K with a PF of 20, you're dosing for 27K with a PF = ~4. Instead of 1 gallon per dose, you need 5.
2. Turn off your SWCG till this is resolved. You're just burning it out, since it can't keep up. SWCGs work best when used ONLY when the pool is functioning well. Turn them off when you're cleaning a mess.
3. Otherwise, the advice is unchanged.
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