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Your duty cycle at 2500rpm is supposed to be +/- 10% of the idle value. Which means it should fluctuate on either side of wherever your duty cycle is. Sounds like your EHA is most likely functioning fine.
Is your duty cycle the same with the engine cold, hot, and at RPM? If so, it sounds like you could possibly be running in open loop all the time. With the key to "on", the one right before cranking, what is your voltage measurement at the diagnostic plug? The duty cycle should be fixed with the engine cold, once it warms up and goes into closed loop the duty cycle will start fluctuating fairly quickly.
You need to establish that the car is going into closed loop before you can accurately diagnose the problem.
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