all I can think of is using a lower temperature thermostat. I think you did most everything else. I have heard that non OE water pumps dont do the job that well. Other than that I dont know.... For what it is worth my father used to tell me that diesels run better hot...He used to drive buses in New York City and he got me my first diesel. It doesnt seem to be in the dangerzone... It might have to be something you have to live with... how much more time are you going to invest in your ghost in your machine

good luck

I like your threads
You are relentless and I can appreciate that

bob