[van462]

What are you using to scan with Forscan, torque app? The only O2 sensors that matter are bank 1 or 2 sensor 1. This is the first downstream sensor the PCM uses for air fuel calculations. Sensor 2 is post catalytic converter and is used to determine cat health. Bosch systems use wideband O2 sensors so the voltage output is not the value you are really looking for. The value will usually be labeled (Forscan)EQ_Rat11 or 21, torque may call it equivalence ratio or sometimes its called lambda. Forscan will convert it to the actual air fuel ratio while many systems go off the the value of 1 = 14.7 and less than 1 equals richer and higher than 1 equals leaner. Usually only sensor 1 is a wideband and the rear sensor may but not usually.
Some items that can send you rich are fuel dilution in oil, as the oil comes up to temp it can vaporize the fuel the PCV system can pick up the gas fumes and they go into the intake and lead to a rich mix. Leaking high pressure fuel pumps can cause this as well. If its a fuel injector sticking you should only see 1 bank display rich.

 

[van462]

a/f ratio looks good, just a tad lean. Short term fuel ratio is a positive number. So its adding a bit of fuel. It may bring the long term back into place. May try disconnecting the battery to clear out memory. Then do a throttle body calibration by turning on but not starting, slowly depress gas pedal and release quickly, turn off, repeat three times.
The dent will restrict some exhaust flow. Possibly cause a slower spool. The further from the turbo the less effect it will have.