Hi folks.
Using the "Follow me" tool on this path that goes around and up and down will result in an unavoidable twisting of the facet.
Using the "Follow and keep" plugin may help.
Also, try to use an arc with as few segments as you can to minimise edges and face count. Three or four segments shall suffice to give a neat look.
You may even try simply smoothing the edges at the interscetion of the two shapes to see if the "rounded" look may be sufficient.
Just ideas.