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Can you do the same tests key off with the ecm unplugged please?
I can't really understand your readings. The only thing I need to know it with the computer unplug the injectors unplugged your meter set to DC voltage. What is the voltage on the two wires to the computer from the injector? If you can explain the numbers better that would help me tremendously. But from what I hear you've got major wiring problems. The wires to the injectors go straight to the computer. You should not have any voltage on any of the wires with the computer unplug as well as all the injectors.
If you had the computer unplugged then you should not have gotten anything on any of the wires. The computer feeds both the power and the ground to the injectors.