MJ - Let me see if I understand you . . . Too much oil is being pumped into the remote reservoir (little oil tank under the cowling) causing it to overflow and somehow the sensor isn't turning off the pump.
1. Could the Cap with the oil level sersor be coming loose i.e. not seating properly around the mouth of the oil reservoir?
2. Or the sensor/float/switch is busted (part 24)?
24 6E5-85730-13-00 OIL LEVEL GAUGE ASSY 1
That would be my guess?
:-/