Try this:
Build something similar to this
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Then split the segments like shown in this picture (split each segment once, then split both segments near the top)
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Bank the segments something like this (In order from left to right: -65, -180, 65) Or you can bank them the opposite if you want the role turning left instead of right. Only bank the middle segments, leave the 2 vertices at each end alone.
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Now save this element and insert it into a new track file. Right click and choose "Select All", then go into the segment settings and set the "Main Track Color" to pure black. Then raise the whole element up at least 10 ft.
Run this through the AHG. Set the heartline value to whatever you'd like. I would recommend something slightly lower than the track style's heartline value. Save as a different file name.
The result...
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...a nearly perfect zero-g roll.