My solution to condensation and lowering humidity levels has been a small pelter style dehumidifier. I did the research and concluded the ones around $25.00 were crap. The one I bought was about $65.00 and has been going strong for almost a year now. It measures 9"X6"X5" and uses 25 watts of AC power.
Even with showering aboard every day, the dehumidifier keeps humidity levels under control.
Skipper, J/36 "Zero Tolerance"