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Sounds like you may have found the culprit. Shy of taking the injectors apart, you can try soaking them in diesel a few days and then install the high pressure lines onto the injectors (out of the engine) and do a "bench test" to observe fuel spray/atomization quality, while cranking . Just...

I know this may be obvious, but are you using the pre-heat function? Even in warm weather these engines don't like to start unless I use the pre-heat. Once they've been running awhile, a re-start is not a problem but for a cold-iron start up they usually like the pre-heat for at least 30-45...