Evening everybody, I'm in need of help again/still
I'll start with info.
I have replaced, radiator,water pump, thermostat, flushed the system, adjusted valves to spec, moved fan closer to radiator, checked timing and is at 9 degrees

My issue is a very strange one, I can drive car all day at 45 and temp stays at the sweet spot about a 1/4 way up the gauge, as soon as I go above 55 the temp slowly creeps up and keeps going until it starts to over heat
I did notice that once I turned into the neighborhood and was doing about 20 the temp slowly came down to about 3/4 up the gauge
I'm at a loss to do and I need a reliable car and this thing is killing me

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Old but hopefully a goodie