I got an official response from Jasco. The firmware version 3.0E dimmers do not (and never will) support smoothly changing their brightness levels via zwave. The older 3.0D version should work correctly. They said their next version of dimmers which they called “500 series” will support this but they are not on the market yet. They told me that they would update their documentation to avoid further confusion.
They also offered me a refund for my dimmers which was very nice of them. I am going to take the refund and try the leviton dimmers instead.