I wouldn't mess with your thermostat. I'd make sure the tuning is correct and possibly within the tuning, turn the fans on sooner. But still at those temps not really a problem. The supercharger adds heat, and your still well within what synthetic oil can handle. If it's already been tuned spot on, then don't worry about it.
A 190 thermo won't change the upper operating temp. Tinkering with the fan settings may. Maybe some Water Wetter also.
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