When you put the CAS in, did you account for the fact that it turns slightly as you push it in to mate up with the cam?
Other than that, sounds like you've done a pretty good job of trouble shooting.
One thing I would maybe recommend (not to keep throwing parts at it) is a Wiring Specialties harness... That way, you know for FACT that the wiring from the bay to the ECU is 100% perfect.
Sucks man- hope you figure it out.
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