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 - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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