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I think there maybe something people are over looking.
Is your water pump old or new? I did not catch that it was replaced.
What can happen with an old water pump, especially in a high reving motor and under boost is that the fins are not spinning at the correct speed they were designed for. The cause the water inside the pump to cavitate, meaning that it will actually start bubbling and creating air pockets in the water. This will keep the water from covering all the surfaces it is supposed to and can make cooling less effective.
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