Hi, this isn't actually very easy to solve at present because we'd need to know the difference in height between the two posts, an attribute that's not currently available in RailClone. To solve it, we're going to add an option when using stepped mode that allows you to choose whether to align to the highest or lowest point on the spline section. Hopefully that will be helful for situations like this one.
Thanks for bringing it to our attention.
Best,
Paul