See if the registry tip from Barry in this thread helps. That was related to revolved shells - so don't know if it will affect ruled ones.
http://archicad-talk.graphisoft.com/viewtopic.php?t=38490
If it does not improved the ruled shell appearance, perhaps the magic wand settings for creating the initial and target profiles will help. See the link from the above thread.
Cheers,
Karl
AC 28 USA and earlier • macOS Sequoia 15.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB
One of the forum moderators