Good point about the AS3, N8!
What I see is that it is very important to clear whatever was used to shine the block, so that the TIM joint consists of AS3, and only AS3, as much as possible. Any other substance, even in the least (microscopic) amount, will reduce performance.
The acetone wash, followed by a hairdryer/heatgun drying seems to be best, as far as I can see, right now (but hey, it's still early!).
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