Thread starts in the early morning. We don't wake-up that early however. Give it some time.
How did you bleed the system? Cooling System Bleeding
Did you unlock the cluster and see what the engine core temp is, when the temp needle went up? If it's in normal range and the temp needle went up, you have bad sensor.
Engine under load would generate more heat. That's why your X is fine when idling since the engine is relatively cool.

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