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these are closed loop values - no trims generated when at open loop (no feedback from the o2 sensors, so no trims). your fra numbers look good - oem Porsche is +/- 0.1. from what I understand, either
(a) your maf is mis-reading the airflow 10% low - vacuum leaks adding air, turbulent airflow into the sensor, vibration, old maf sensor, dirty maf sensor (oiled filter ...) or
(b) your fuel system is delivering 10% less fuel than requested - dirty injectors.
again, the 10% is within Porsche spec, so looks all good (although you might need a few more miles to get the ltft to settle down).
dunno much about idle, other than, if it is idling ok, then I wouldn't worry about it.
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