Agree that all humidors will hold humidity better when full. Make sure your humi is at least 50% full. If you don't have the cigars, use empty boxes. Actually, how big is your humidor?

Put the Oasis in and leave it there for a few days to let it level out. You might have to refill it once or twice to get the humidity up. With your cigars in there, leave it closed for a week or two to let the environment even out. When you open your humidor the level will drop pretty quickly, but the cigars will retain their moisture.

Patience is your friend here.

spiffy