if you have a 185 degree thermostat, it will not be completely open until around 195 degrees so.
it seems your cooling system is working well as is. if it doesn't exceed 200 degrees, i wouldn't worry about it.
if you have any coolant mix at all and a 16lb cap, i wouldn't worry about 210-220.
the more heat, the more efficient the engine will be, gas mileage and horsepower.
just my opinion, your mileage will vary.