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The spade from the injection pump connected to the green wire does two things to the pump when energized, first is case pressure is reduced to less than 1 PSI (normally 10 to 12). This case pressure reduction increases plunger filling rate which can increase power over all speeds. The reduced...

It could be the throttle cable, you mentioned the 1/8th turn..is this on the throttle shaft? When the pump is calibrated for idle, it is spun at 650 RPM engine speed (pump spins half this, 325 RPM ) with throttle at idle speed. Injected quantity is then adjusted by varying the internal low...

Idle speed is governed internally, who rebuilt the pump? Have you modified the maximum fuel delivery limit? Removed the guide rod?

Idle speed is part of calibration, most 6.2 are set at 650 RPM and injection 12.5 to 16.5 mm^3 per firing stroke on each cylinder. The volume of diesel injected dictate engine speed. When cold, the throttle is held open a bit by the external high idle solenoid. The power to this solenoid...