Have you had an infra red temp sensor on the thermostat housing to see if it really is getting to hot before wasting your money????
 
UPDATE

bought a infra red sensor. Various pics below showing readings from various places with the dial reading and then with the heater on
 

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If you are going to use one of those , make sure you read the instruction manual and understand about the emissivity and the cone of reading / distance / area.

Cheers
 
You to far away from the point at which your trying to measure...around the thermostat housing area in a good start.
 

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