I talked to the Roadster owner today and asked him about the pumping of brakes and he said that the when he goes down the track and has to stop/slow down there is no pumping of the brakes.
He only does it first thing in the am when he gets in the car. After that the brakes are great, the pedal is not soft and would be comparable to the dragster he owned
He has also been working on the problem and believes it is the Metric calipers opening up over a period of time.