You get this resolved? I'm thinking about buying a set of these, so would be a bit of a comfort to know that you got your problem figured out.

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"If only he had used his genius for niceness, instead of Evil." M. Smart

When I first got mine they read really low (<100 watts). After a couple hard sessions the pedal pod was clocked 20 degrees or so. I moved it back in place and tightened it down better and my power immediately started reading around 200.

So just make sure you used the right amount of spacers and give a couple hard sprints and see if the pod has rotated at all.

Sounds like you did something wrong or that somethings wrong with your pedals. I've had mine for a couple of weeks without any trouble at all.