Try flushing the cooling system and check the radiator for air obstruction while you have the system drained. Her Dad's idea definitely has merit. Raising the CO baseline may richen up the whole map and make it run slightly cooler. Of course, it could be as simple as a sticky thermostat that doesn't open completely. That would be another thing to check while the cooling system is drained.
If you have TuneECU you can check the map and the CO setting as well as several other parameters that effect operating temp, otherwise the dealer can do the ECU analysis for you. Let us know what you find out.
Sent from my iPhone using Motorcycle.com App