Best high flow thermostat for a 1970 440?

Last year, Car had a Motorad 195F, then I tried a Gates 195F thermostat. Over 85F, car was running at 210F (225F in traffic), so I put a 180F Summit thermostat in. Over 85F, it runs at 200. (210F in long traffic). I kind of understand why the drop, since thermos start to open at that rated temp and are not fully open until 5 or 10 degrees hotter, plus rated opening temp is not accurate, but whatever, I was happy.

My problem is now when weather gets under 60F, it runs at 160F. It warms...

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