I just did a post cat O2 sensor in an 06 Corolla today. On test drive, my fuel trims were constantly around 7% max between short term and long term. I’d look at that post cat O2 PID if you can and look for it to stay in the .4 to .7 volt range. If you mash the gas pedal to the floor, your O2 should go full rich and hang out .8 to .9 volts and then on decel, you should be able to bottom out the voltage to nearly 0 volts. That might be a good indicator that your fuel trims are actually where they need to be. If your fuel economy is back where it’s supposed to be, it might be time to stop looking further into this.
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