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MikeS! Good to read your analyse! I have only one thing in mind. If that 9 pole connector above brake booster is corroded we can still measure +12 volt at pin 2 & 3 when ignition is ON, with or without LOAD. We can measure same voltage at all injectors as well. Even a noid ligth would flicker, an oscilloscope would get the wanted curve on its screen when cranking. Therefore, one must be absolutely sure that this vital circuit is Low resistance all the way through this multiple pin connector. A year or so ago there was a picture here showing this 9 pin connector melted, caused by high resistance and current trying to pass through it.
I would clean those male and female contacts there, lubricate them before putting them together again, followed by new measurements at the injectors. I would also try to connect a 20 watt bulb between +12 volt live pin at each injector and chassi ground (ignition ON). The bulb should shine brightly at all four places.
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