Surface from points , U count is not valid

Hi, I have attached my code.
I am trying to add something to each z component from a grid of points and construct a surface from that.
I have the expression for U as x+1.
Would it help to reparamatrize as polar or spherical?
Thank you.

here is an image of my code for reference (16.5 KB)

Note that you need to flatten marked input:

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