Grasshopper Closest point & Amplitude vector adjusting

Hi All,

I want to adjust the vector as the blue arrow I drew on the first picture.
It should be planar not gradually pointing down

second picture is the logic,
and I think some adjustment can be made in the blue dot (between Brep closest point and Amplitude) on the second picture to make it work.
any suggestions? :slight_smile: (20.0 KB)

One idea:

Oh my it worked!!! Thanks :blush:

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