The restrictor is just a simple tube with a fixe-sized hole drilled.
Can you see through the hole, if you can't it is blocked. Send me a picture of the install of your restrictor. I have seen one time in the past people put it in the wrong side of the inlet fitting. Here is a diagram how it should be placed:
Question: can you tell me the numbers on the small label on the left side of the circuit board. This will tell me the flow table flashed into your controller.