As long as the exit radius is straight, you can use:
gfOne = cos(slope_out)
for the starting g-force of the next element, and set the entry slope equal to the exit slope of element 1.
If the end of element 1 is concave up (creating a more positive g-force):
gfOne = cos(slope_out)+[(speed_out)^2]/(radius_out)
If it is concave down (creating a more negtive g-force):
gfOne = cos(slope_out)-[(speed_out)^2]/(radius_out)
I'm not sure how to do it when the FVD element is sloped and banked at the end. I would try to avoid that.
That's the simplest way that I know, but that "Exit Properties" part at the end of the FVD code might offer an easier way to get the same result.