Could send me a screenshot of that? I have used simplify 3D and it worked as expected but maybe you are getting different results. Do keep in mind some of the chambers are not connected and are primarily used to provide floatation.
I also recommend if anyone has trouble be as specific as possible with details regarding printer, slicer and settings. There is a lot of experience in this community and others may be able to help. And blow as hard as you can there definitely is an airflow threshold.