This might be a shot in the dark but...
It is possible that when you lapped the CPU you might have not had it completely level...IE...more off one side? But still got it too look lapped level.
If this is the case you will have to use the 4 bolt holes to mount the block and maybe tighten on each side till you achieve the best temp.
I use the bios to set the block...I adjust the bolts until the lowest temp is achieved.
Makes for less errors.
Tuff
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