Shane sent me a brief video showing erratic fuel pressure at a steady load on the dyno (in vacuum). On the BlaqOPs kits only the main Wally 255 is running under vacuum. He suggested that we try swapping it out with a new one as a test. I guess that's a reasonably-priced thing to test.
If necessary I will have BlaqOPs modify my stock hanger for their system (how they normally do it) and ditch the Full Blown hanger. Chris @BlaqOPs says that he has a fuel pressure gauge on his car and it definitely shouldn't be doing this: