Hot Dang!! That's some serious improvement, in the league of water cooling. It's hard to determine whether the gains you report are due mostly to lapping alone, or Arcric Silver2 alone, but it's probably a good marriage of both. If I remember correctly, those reviews I've seen on Arctic Silver vs. the other thermal interface materials puts AS about 2 or 3'C below normal silicone/zinc oxide grease at most...