Yeah mate I know, I"ve read the tables too,with 400hp atw apparently the limit on std AFM(or Scoop may prove us wrong)
But they both read roughly the same,using the sw check they seem to fluctuate within a few millivolts of each other.
Could also be due to the cold weather as I never noticed them sitting that high in the summer.
It would be interesting to see other peoples power and peak voltage..