From the situation you describe it sounds like you need a better grade of humidifier than the Cigar Oasis (or Hydra). Both of those are good, but they are not great -- at least not in my personal experience.
I would suggest that you look at the Set-and-Forget from Bob Staebell (
http://www.aristocrathumidors.com/electronic.htm) or the Avallo Accumonitor from Cigar Solutions (
http://www.cigarsolutions.com/catego...o-Accumonitor/).
Both are very good -- much better than the Cigar Oasis -- and with the swings in ambient humidity that you are experiencing it sounds to me like you need a better solution than what you have today...