Yes I found the same thing. Used a bit of (lapped) copper sheet 18SWG (0.048") fixed on the VRM with thin thermal pad and MX2 on the top of the copper which makes very good contact with the aluminium block.
Here are the results with q6600@3.4Gz + 2 x 4870s in Xfire+ NB block+ mosfet block all on the same loop with a TFC 480. Running OCCT and rthdirbl
Room temperature 25.1 degC
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