Creating Toposolid from Import is sometimes totally inaccurate (specially on narrow slopes) because point try to connect with closes points instead of follow the countour lines. Please, make revit automatically set split lines for each contour line of the source CAD (connect the two dots at ends) in order to make toposolid respect the survey site condition.
To solve this I had to manually at split lines on vertex of CAD (cause non-vertex point of countour now have not snap) o add new sub elements points/lines closed to create ridges and valley (with height difference that do no generate new contour lines) in order to separate folding lines that should not exist.
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