I would recommend pairing the ‘Power Source’ and ‘Controllable Trainer’ options under ‘FE-C’. This protocol will produce more accurate readings with Zwift.
However, I’m not sure about ‘Cadence’. If you have a ‘Speed/Cadence’ option, I would recommend selecting that one. Do you have a speed/cadence sensor on your bike? If so, then that’s the one that’s being picked up. If you don’t have a speed/cadence sensor, I would recommend getting one rather than pairing your Elite trainer as cadence. You will receive more accurate data with the actual sensor.