Cannot Get Chlorine / pH Levels Dialed In

Hi All - I have an older 450 gallon CalSpa. Had a ton of water issues last winter because I wasn't staying on top of the chemicals. After owning a pool over the summer I've got a better understanding, but still struggling to get my chemicals dialed in. Hoping you can assist and tell me what I'm doing wrong.

1. Filled tub in October. Raised FC to 3. Purged with Ahhsome, twice.
2. Drained tub same day. Cleaned/wiped down. Refilled.

Since then I've struggled to maintain any FC...

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