I never used the stock heatpipe to be honest. I tried that on a P5W and it was so bad that I never wanted to use one again
I first put a Zalman NBF47 on the NB first, but it got way too warm even with a 80mm fan nearby (55-60°C measured on the backside of the board). Now with the HR-05, I get readings of 30-33° Much better and absolutely "enough".
Everest doesn't read any temps related to NB, that sensor always shows 28°...