FYI, here was Bob's (Aristocrat) response:
RE RH: I find that the bottom tends to have higher RH vs the top more often. It goes against what the physics says should happen--but from actual observation humidity can be a couple of points higher in the bottom. Most of the time it's within acceptable range, however if one is in a higher ambient RH environment, the fans don't run as much & the RH can go more than a couple of %.