Correct Spiral Surface

Hey guys,
Happy New Year!

Just a quick question. Was struggling to build a spiral shape.
So the problem is when I try to subdivide the surface you immediately see the problem. Curves are not spaced equally because the surface is wrong.
I think a problem with original spiral curves, if you look at the plan view the spiral is not smooth.
But I have no idea how to fix it?

Thanks for help (28.0 KB)