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If it were me, I would replace the thermostat to be sure that it's working properly. I don't think that your ECT / EOT spread is that bad especially at the higher temps. I almost never hear my fan kick on (even when pulling my 5er) and unloaded my temps sometimes hit 200 or so, but will fall back down to 190 where it likes to hover. Thermostats are not expensive and easy to replace, and if you haven't done so it would be a good place to start (than buying a fan). Also, plug in the EGR valve, I have read that an unplugged EGR valve may adversely affect the fan operation.
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