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As others have said, I'd try a new O2 sensor first. Also make sure the brown jumper wire next to the DME brain is connected. The factory cat will last a very long time, unlike the ceramic aftermarket cats.
It won't work to try to lean or richen the AFM because once the car reaches operating temp, the system will go into closed loop, and the lambda control will take over, locking out any changes that you may make to the AFM.
If the new O2 sensor does not work, see if you can borrow a known good cat for the test.
P.S.: Also, as O2 sensors age, they send a weaker signal, which causes the mixture to richen, not go lean.
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