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Ahh yes...we are getting into the complex world of mathematically computing 3 phase loads! The reason you can't just measure the real load on a single phase and get an accurate current flow is that the leg is also doing some work on another phase (for example, you can't just calculate current...

The engine surge has to do with the real load on the set; sounds like it may be having a difficult time keeping up with the load you had placed on it. A sign of wet stacking, a weak injection pump, or low compression. Most of the sets I test are capable of around 150-160% of their rating in...

This looks pretty normal to me...those engines typically smoke a little. The wet stacking that Harleyd315 mentioned is very common with these sets; I have load tested a few that took several hours under full load to "clean up." I would run it under 100% load for a few hours...I will bet that...