No, the fpr doesn't guarantee pressure and volume. The FPR can only flow so much. At higher loads the injectors run at a much higher duty cycle and effectively bleed off a good amount of pressure. I could imagine the increase in pressure from the pump killing an old FPR.
What you're calling "out of spec" is nothing. A cheap meter alone may report that far off. What temp was the resistor pack when you measured it?
I think you're starting grasping at straws and need to go back over what's been covered, see if there's anything you've neglected to check that's been listed.
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