You have to try and imitate natural conditions as much as possible. In nature, the following happens:
1) Air enters cave
2) Air is humidified as it slowly moves in, with a mixing zone up front, finally reaching 80%+ RH as it goes in deeper
3) Ideally, constant air flow is maintained for air exchange, with a variable air velocity based on season and location
So in your scenario, consider
1) How are you humidifying the air as it moves from the outside in? Especially as it relates to a condenser, is it freezing on the coils? Where is the buffer/mixture zone for humidifying the air?
2) How are you slowing down air velocity to evacuate air?
3) How are you distributing old and new air and evacuating the old? What is the convection path?
4) And regarding temp gradients, how does the air distribution ensure even temp through the space?
If you think through all these considerations, you should be in a very good place figuring out the right interplay. Also, RH is sometimes misleading, especially with electronic gizmos. Water saturation or a psychrometer reading sometimes yields more usable results. I'm not sure which way you should go, not completely understanding your setup and pic did not come up.