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What does the space between the intake grills and the radiator look like? Are there gaps where air can "escape"?
I would do a total block on the upper grill, and work your way down to a single opening in the lower block that keeps the fan from coming on most of the time, and keeps it from needing the fan for very long.
You also might benefit a LOT from a ScanGauge or an Ultra Gauge; both for the temperature and for the mileage, as well.
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