With the most recent case I added fuel then additive to a tank that was already one half full. If I am correct the additive would have to settle to the bottom through all that fuel before being sucked into the intake. Does that seem plausible?
As to dead organic material being the culprit, I think it should be filtered by either the racor or spin on engine filters. It also should show up in the racor bowl. The filters are not clogged. Is it possible the buggers are so small that they would pass through both, pass through the motor and make it die, but not clog the injectors or leave any other trade of being there?
I am new to diesels and appreciate any input,