Constant Airspeed for Maximum Flight Endurance

The plane in Auto or Guided mode on a long straight mission is set to have a target airspeed using TRIM_ARSPD_CM. When this is set to 1250, the airspeed fluctuates ~20 cm/s. I want to get this deviation down to <10 cm/s. How can I go about holding a constant airspeed for maximum flight endurance?

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