Good review, thanks!!
Quoting Leonardo
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Tim, if you pull off the heatsink with paste already on the CPU heatspreader, then put it back down, you have most likely seriously degraded the thermal dissipation potential of the paste. What that does create tiny air pockets within the paste, insulating the CPU.
True statement here. By now you should know how much you need, trust that is right and don't pull it back off to check.