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Speed variance depends on a lot - water conditions, weight / ballast in boat, set speed, how hard someone is pulling on the rope, engine power, etc. You can try increasing / decreasing "response" (under SETTINGS -> USER SET) to see if another setting works better for you. Higher numbers increase the aggressiveness of the control system (which will accelerate harder to respond to a change in speed) whereas lower numbers make the system more "smooth" (and less responsive to changes in speed).
That's essentially what the "response" parameter does - tunes the control loop gains.
Well crap - Learn sumpin new every day! I get to play with the loop control! Been tuning loops for 30 years.
Good chance sometime in Jan/Feb!
Heads up that the 2022 discount is coming soon!