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The ventilation is not used to control humidity in a cabinet incubator, if your humidity is too low add a sponge or two to your water tray, teh ventilation is critical proper temp balance and fresh air for the developing eggs.
Hope that helps, it will dramitically improve your incubation and hatching success.
i failed to add, once the ventilation is set correctly you have no variation in tray temps what so ever, and a decreased low to high temp swing as well. You can often see a 1.5-2.5 degree temp swing from the time one turns on till it turns off then additional 1/2 a degree or more as teh element cools back off, once the ventilation is set perfectly all teh trays will be balanced, and temp swing will be 1/2 degree or less from on to off. It makes a huge difference but often takes 8-10 hours to get set perfectly. Make sure you are not using it when setting it, though. Once the ventilation is set right then you can properly adjust the temp, once temp is set adjust the water tray by adding or removing incubation sponges until is right as well. one step at a time and you will get it right.