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Good info on not using the 93 octane chip in CA. You could buy some octane booster for the test. A Cat has to have a good fuel mix to be efficient and you're running rich. Don't get me wrong. You may have a weak cat but it needs further and complete diagnosis.
The Stable. Sounds expensive. Make sure they have a 5 gas exhaust analyzer. If not you may want to reconsider your shop for this repair. Anybody can slap on a fresh cat and an O2 sensor to make it pass. This is a classic smog failure repair instead of a thorough diagnosis.
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