Ha you done what MQ MAD Had suggested and had the radiator rodded out (entails a proper clean by a specialist ,not by a hose)?
That's what I would do first.
I have problems with mine running hot on hot days when stop starting and that is due 2 one of the bottom cores been damaged and was blocked by the radiator specialist .
Cheers
Todd
Time is never wasted when your wasted all the time 
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