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Bill,
First things first. The system pressure is too low. You know how to measure it and you know what controls it. Add a shim as necessary and work through that issue first. I had a copper washer around that I added to get my pressure towards the high end of the range - I think I added a thick one and removed a thin one to end up at the pressure I needed.
Next, control pressure is too high. The WUR should let the fuel flow back to the tank. Is it? Perhaps you could have the fuel leave the WUR and go directly to a container to isolate it from the rest of the fuel system. With the CIS test kit it sounds like you have, you can close the valve, then open it just long enough to measure the flow through the WUR, then close it again so as not to overflow your catch container.
At least you have measurable issues that you know are wrong that you can sort through. In other words, at least you aren't blind to the problem(s).
Brian
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