Looking into it further, the ACS version might not be lower. Although the Schnitzer spring is shorter, the change might be more to do with driving dynamics than appearance.
Eibach: 94mm dia, 14.00mm wire, 294mm free length, 9.75 turns.
ACS: 100mm dia, 14.75mm wire, 288mm free length, 8.75 turns.
So the AC Schnitzer springs are shorter but larger diameter and thicker wire. The Eibach version is a generic item found on lots of models whereas the ACS item has a specific F36 part number, so I suspect was made to help the slightly wayward rear end of the GC with its heavy tailgate.
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