How does a laser temp gauge read? Most people would be deliriously happy with a radiator that cools as well as yours does. Is there some overriding reason for insisting on a specific coolant temperature? If so, just block off part of the airflow until the gauge reads where you like.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!