By doing that test you proved that it was a problem with the injector driver circuit so Holley tech support should have been willing to do an ECU swap. If you hadn't done that test then they would've played 20 questions with you. Once you are able to prove that it isn't an injector problem then it gets easier to get a swap. Bummer on the whole thing since it chews up time but that kind of stuff happens. Parts fail sometimes.