changing the surface mode is making cura create double lines, what i don't get is that the default ultimaker profile doesn't need to make any of those changes and it is working fine. other profile seems to have issues with this single wall model.
surface mode normal
remove all holes ticked
spiralize outer contour ticked (forces single wall)
using a line width of 0.39 and not 0.4
select surface mode in the slicer settings
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