Do you like having moisture and contaminants build up in your oil? That's what happens if your engine does not run hot enough for a long enough period.
The fact is, as long as an engine will cool back down after slowing down, it is not overheating. Overheating by definition is when an engine gets to the tipping point and cannot recover to a cooler temperature. Yours is obviously not doing that. You are simply creating more heat without the OD unit by spinning the engine at a higher RPM. 210 is your new normal for now and it will not hurt a thing. In fact, it is a very healthy temperature for your engine, whether you "like" it or not.
Most modern engines don't cut the electric fans on until around 230 degrees. That's because over time, engineers have learned that boils impurities, contaminants and moisture out of the oil. You don't have a problem. My advice is don't make one.
