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And no indication there is a problem with the overflow allowing fluid to move back and forth and remain constant so as not to have air sucked into the engine? What about the radiator cap itself? A weak cap can do this, as the engine warms up, if the pressure isn't maintained and it can allow the temp to rise and swing like this. At this point, out of safety for the head gasket fear, you could get an electric water temp gauge with actual numbers on it to see if indeed it is heating up to the point of boiling over point. Not sure what the expected running temp is, I know one of the other guys does, but I would figure right around 205degrees, If it's burped good, lack of pressure is the only thing it could be.