@TimG I never see 3 bars on temp gauge when riding. Even up steep slow stuff. Always 2 bars. I have seen 3 bars when starting after shutting off but ones bato 2 after 1min.
Park on a slope so front end is higher than rear and let idle with rad cap off?
FYI - I did flush coolant system 2 years ago and drove on car ramps to get air out. Bought it was good.
But hey I’ll try anything!