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Either your radiator is too small or its dirty. Mine stays at 180 until I slow down and have only one of my dual fans on. As soon as I turn on the second fan, right back to 180. I chose electric fans because I race it once in a while and I can cool it down while parked between runs.

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My savoy does the same thing,the small rad is just not cutting it at high-way speeds but runs cool in traffic just idling or cruising.
Sometimes just a small amount of slag will cause high speed overheating issues.My rad is brand new but I just have too much engine to cool with a 19" rad
Gus