Doesn't AS3 have a period of time before it reaches it's best?
With this statement from their site:
Quote:
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During the CPU's initial use, the compound thins out to enhance the filling of the microscopic valleys and ensure the best physical contact between the heatsink and the CPU core. Then the compound thickens slightly over the next 50 to 200 hours of use to its final consistency designed for long-term stability.
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Don't know how much affect this had on your measurements but it might be a cause. With your blocks performing so well a small change in the TIM would be more apparent than with a lower performing block.