Over the weekend I found another plus for the way I did the ceiling (boards unfastened). My living room floor above the wood stove isn't insulated, and before I installed the basement ceiling, the floor would be nice and warm when I had a fire in the stove. After the ceiling was installed, I wasn't getting as much heat to the living room floor.
I made some 3/4" blocks and propped the edges of the ceiling boards up to allow the warm air to get to the floor above. When I checked the floor with my laser thermometer, the floor temp went up 5-6 degrees.
I'm thinking about ripping some of the ceiling boards a little narrow to allow an 1/8" gap between them, enough to allow air flow, but not enough to be noticeable. For now, propping them up makes a big difference.