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Checking multiple spots and the radiator hoses would be a good indication if the thermostat is opening properly.
I've also seen what people thought was overheating/boiling coolant was actually blown head gasket putting combustion gasses/pressure into the cooling system.
Have you verified any of these temps using a laser thermometer? These are notorious for the gauges to be inaccurate, or wiring issues with high resistance causing incorrect readings.