Thanks for info, dejanh.

The variable performance response is interesting, the 2 things I did differently ....below is a pic of the level I told you I used on cpu socket, got it at home depot back when hanging a tv on wall, that and I used calipers so all 4 screws on HK were 18.8 mm (supposed to be 19.6 but I had uselessly lapped mine, not .8mm, but just what I used). I was just trying to make sure the reflow was thin and uniform, especially after vapor made point of saying make sure horizontal.

You can see even my desktop is not exactly level, but my cpu socket was during reflow.