Passat (B6) :: Power Tailgate Height Adjustment?

So I can successfully set the height at which the tailgate should stop, and in fact, the "power" function seems to stop there. But once the motors stop doing their thing, it just keeps slowly creeping up, as though the gas pressure in the struts is too strong for the tailgate weight. It's brand new, so this wouldn't be surprising. But is that the way it's supposed to work? If so, what's the point of setting a height at all? In my case, I want it top stop just a couple inches before hitting my garage door.