Path Duplicator with Arch as template in Quark

I've been trying to create a tunnel in Quark using the Path Duplicator with an Arch from the shape builder as a template and there are many errors on export. As long as the tunnel remains straight or with slight curves, it's all good but once I put in sharper turns or a descent, it gets into a mess.

Here are some of the errors that come up depending on how the tunnel is shaped:

"Error, line out of clip!",
"This should never happen: 0 verts in a vis link?",
"Vislink cannot be coplanar with a node!"


In the console, while exporting I get the following:

"::createBaseWinding: Bad face on brush. < 3 points. DMMNOTE: Handle better?"
or...
"::createBaseWinding: Bad face on brush. > 32 points. DMMNOTE: Increase max win
ding points?"
...repeated over many times.

One thing I noticed is that sometimes when the "subdivide" arg in the Arch Maker is at 2 it works (even though the console still shows the above) and when I change it to 4 to get more of a rounded arch, it doesn't. I would really appreciate some help on how to create a windy tunnel that also descends with an arched ceiling - hopefully using the path duplicator because that just makes it so much easier. Thanks for any help!