In your first post you said that in mounting the NB block you used the "paid" from the original heat sink. Do you mean the thermal pad that stuck the original heat sink on?
IF so that may well be the problem, might want to do as BrainW suggested and remove that thermal pad and put it on with some good termal epoxy. A better TIM will have to help.
With the NB block cool to the touch but the board reporting 100C it has to be in the TIM or the boards reading really crazy, best I can see.
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