Hi bz, so that's normal that the result won't necessarily completely hug to some other lines that you've drawn - that final edge is now being generated by a projection of a side curve rather than coming directly from those 3D curves that you've drawn. It should be precise in the sense of it having the same side profile as the cutting profile though.
That's kind of a normal part of this type of modeling in general - many times the final edges that you produce are not things that you draw directly but rather come from intersections between surfaces.
If you want to control it further you'd put some more work on adjusting the surface shape.
Maybe I'm not entirely understanding what you are objecting to here though....
- Michael
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