Watch the timing for detonation at WOT, 39° is pushing it and may actually lose power.
I did notice that it lost some pull at that point,no detonation though. I will bring it back down to 35

Good job on the vacuum. AFR gauges are great! Just remember a miss fire will read lean, always check and read the plugs.
When reading the plugs, how long must it be driven to get a good reading on the plug? Once it's read and you change a setting, do you put new plugs in every time?