Ok, well on that subject I agree. There should be very little to no vacuum at WOT. If there is a significant amount (over 1 or 1.5 or so) then your carb is too small for your engine. I posted a link to a chart that shows the difference between ported and full vacuum, but I think I'll post it as an image as well.
This was taken from http://www.gofastforless.com/ignition/advance.htm
As you can see, the vacuum drops to almost nothing when WOT is reached. And for all the times, except for idle (and near idle) and WOT, the vacuum is the same.