SOme crazy questions: since you have the 8 bolt pump, do you have the divider plate in there? Any trapped air? Gauge accurate?
How about leaving the cap off the radiator and observing coolant flow at idle, when it opens?
There must ba an answer...Try adding a box fan in front of the car when idling to see if the xtra airflow helps.
Maybe post some pix of the shroud/fan setup?
George
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