If the FL are in the same site you cannot have two different z values for a common xy. You need to keep the common edge separated by a small amount.
If I am interperting your needs correctly. The cut slope you are trying to achieve is around the perimetrer, and the plattform are very close with 3-4 meter vertical separation; the grading fails because it find itself daylighting on itself.
1. set the platform elevations (separate) the adjacent edges by a small amount in a common site
2 . infill the platforms
3. perform the daylight grading for 3 sides of each platform stopping short of the common edge.
4. add FL connecting the adjacent daylight lines
5. exrtact intermediate elevations from EG for the FL in step 4
I
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