A consistent negative correction in the higher ranges may indicate a boost leak. A negative learning value means the ECU is pulling fuel because of a perceived rich condition. Other possibilities besides a boost leak would be a bad MAF or front o2 sensor. Generally, a/f learning #1 should be within -/+5%.
Try resetting the ecu and drive around for a few days, then see if the learning view is the same.
335HP/360Tq VF-22/1820 clone with Meth