I think you understand my problem correctly. But the issue seems to
be, when you miter the molding at a 34 degree angle, the length of the
cut edge is maybe 10". If I just bevel the return at 45 deg., I will be
trying to line up a 10" edge with a 6" edge. When I cut the return at
a 34 degree angle also, it seems to go in a different direction (down
from the ceiling, instead of back towards the wall). Which makes me
think I am not orienting the return piece correctly on the CMS when i
cut it. But I have tried turning it around, upside down and backwards,
and I still can't get it to work.