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Replacing the o2 sensor just because the vehicle is reporting lean and subsequently enriching is silly, there are a dozen different problems that could cause this condition and just replacing the sensor that reports the condition is literally "shooting the messenger"
The post-cat o2 sensor really, genuinely, no-myth-about-it is not used for fuel trim. Period. In fact it CAN'T be used for fuel trim. Think about it: there's a frickin catalyst right before the sensor, how would the sensor know whether o2 readings are skewed by the effectivenes of the catalyst at that moment?
Replace your fuel filter first, it needs it anyway by 30k miles. See if that corrects the problem. Then use a fuel pressure gauge on the port that exists for that very reason to diagnose the problem rather than just randomly throwing expensive parts at the problem in hopes of accidentally curing it.
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