I used the American Powertrain Hydramax bearing kit in my Duster. Set the proper air gap and after bleeding and driving my bearing now rides on my diaphragm clutch fingers. Seems to be a common issue with these kits.
I called the company that I got mine from and they said the air gap is just so you don't over extend the bearing on initial stroke of the pedal. The bearing rides on the fingers is how they were designed.