Steve,
There is an adjuster screw on the headlight bar to tooth plate which hits the down position limit switch to stop them. You just need to adjust that a little by the sound of it. Don't go too far with it or your buckets will hit the bumps stops before the motor cuts out and stress the motor. It might require a bit of trial and error to get it where you want it.
You say headlights plural so I assume both are a little high? which is good as adjustment between the two is somewhat more of a PITA involving shims etc.
Julian
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