Sounds like the ecu sending too long a pulse signal to the injectors. No idea why, or how, but it seems you've looked everywhere else.
Did you say you used a Nanocom to check the ecu? Not having any experience with Nanocom, I don't know whether you can adjust things like injection dwell times on your particular engine. Is it the original ecu?
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1999 Disco TD5 ("Bluey")
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