I had a similar problem with overflowing because I over filled the radiator. Yes the coolant seeks its own level. To be certain about the temperature, purchase an infrared heat gun (about $30 from Harbor Freight) and measure the temperature of the radiator top to bottom. You can do this with a higher RPM idle speed and make sure you are not with retarded spark. You should measure about 155 Deg. F for normal. Remember you cannot fix what you cannot measure. Good Luck. Me feeling is that you will be fine.....but let us all know.
