Brad,
The prodigy has an internal accelerometer that helps modulate the braking effort. I see the same kinds of readouts for moderate braking. When I set up my controller, I increase th boost until trailer braking just starts to exceed truck braking. I will begin to feel a little jerking. Then I back off the boost until the jerking just goes away. After that, I don't pay much attention to the readout except to make sure things are working.
Dave
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