Clutch fan operation

I have an Auto Meter gauge, beside the know nothing factory gauge that came with it. I have a 180* Stewart thermostat in it now and the gauge is right on 180* and the factory gauge is 1/4 the way up on the display I am pretty certain it's running where it should be. I'm thinking that if the engine ran a little cooler than the clutch wouldn't come on as often. But I guess my thinking is a little simple. As far as the "new" fan clutch goes I have always read here to stay with the factory units because they hold up better.