My bad. I meant MAF. I used to have a Matrix (tall Corolla) with MAF.
There is no rich condition if the front O2 sensor is working correctly.
The fuel trim #s just mean there’s a discrepancy between what the sensors indicate and what the fuel map expects.
Are you getting higher than expected fuel consumption?
Engine temp seems to rule out a failing thermostat.
However, with the car standing still the temp could look okay even with a sticky 'stat.
That leaves tire pressure, dragging brake or wheel alignment as possible causes.