Yeah, low humidity is commonplace in Alberta (the Prairies in general, really). So much so that even Vancouver feels very humid to us, even though in my mind I know Vancouver is quite tame when compared to Toronto, or Recife, or Hong Kong, or Mumbai . I'll try having a tray beneath the hanging negative. Would warmer water be better do you think?
Warmer water will increase the humidity more.
One caution about the tray - it is best if it is slightly off to the side, because if the film slips and falls .....
“Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”
Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2