It sounds to me like there maybe two contributing factors;
1) Inadequate mixing of the fuel and air in the combustion chamber, causing lean and rich areas in the chamber. This might be helped by increasing the fuel line pressure by decreasing the injection valve lift by increasing the valve lash. There are many theories on the correct way to improving mixing in the combustion chamber such as shrouds on the valves or swirl inducing features in the gas port.
2) Incorrect fuel mixture in the precombustion chambers, have you attempted to vary the pressure of the fuel feed into the precombustion chambers?
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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