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The flow at higher heights will be closer to a free flow conditions and lowering it will approach a more constrained flow situation and cause the transition to turbulent flow to occur sooner.
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GenKreton, that is certainly an explanation that would fit the observation that lowering ride height on a smooth-bottomed vehicle increases the drag--the smooth underbody would have laminar flow for some distance before the critical Reynolds number would be reached which would turn the flow to turbulent. Anything that would move that point closer to the front, such as creating a more constrained flow condition, would presumably increase the drag.
Thanks for mentioning that....
--Steve