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The angle shouldn't be 130 degrees at low RPM. That means the pump is using maximum effort to maintain pressure.
What cam lobe are you using? Is there a lash cap? Was preload checked when installing the LT4 HPFP? Do you have the stock check valve installed on the low side line still? I've seen where the check valve fails a certain way and starves the HPFP, but I have only seen it at high RPM...not at idle....but perhaps its possible?
130 degrees at WOT means the car is out of fuel, but it shouldn't need 130 degrees at idle to maintain pressure.
I would remove the HPFP and inspect for damage and see if you can borrow another LT4 pump to test with.
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GM Gen V Calibrator
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