I know nothing specific about that engine, but will say it sounds like low comp ratio. This is usually caused when repairing by reseating the valves into head too far. Most diesels you cannot reseat even one time without running into low comp ratio. Problem is, I have no idea what their protrusion or recession should be . Also, many times a thicker head gasket than original seems to find it"s way into production. If it works good under a load, I am sure that is your problem. I did notice you said .010 end gap, that is pretty tight as that has to be at least a 3.5 inch bore or most likely larger. Late timing is about only other thing and or very low volitility of the fuel.
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