Carlos,
I think 0 Pw at the point of flameout is correct, as the ECU has shut the pump down once it detects falling rpm below a certain threshold.
Download the ECU data (assuming you have the correct ECU to PC cable) and look at the data immediately before the flameout. The ECU stores over 50mins of run data every 0.5sec (if I recall correctly).
You could always e-mail the ECU data to Gaspar for advice, as he is excellent at customer support.
Paul