I bought an X500 a few days ago and I've found that it rolls forward quite easily when my foot is off the pedals, and it's on any kind of a slope. I realize that most hydros creep forward on a slope, but the X500 is doing more than creeping. I would like better control when on a slope by a drop-off. Could this be improved (hold position better) with an adjustment of some kind? It holds position much better in reverse than it does going forward.