Geometry - Spiral Staircase not rendering (overlapping UVs)

I am trying to add a spiral staircase to my level using the geometry tool.

I’ve got the height and length to size, then covert it to a static mesh. Add collision and UV light map… and this is where my problems arise; I can’t seem to find the correct settings for the light map. Everything I try ends up with Overlapping UV’s.

Does anyone have a solution?