[cheshired5]

You're showing kPa (positive pressure) and In/Hg (vacuum) at the same time so I'm not following your figures at all.

The dashes you're typing are adding further to the confusion. I don't know whether the dash means minus or something else.
If a figure is a minus figure, type minus then the figure otherwise leave dashes out of your figures.

Some actual screenshots would probably help.

Also with MAF use kg/h or g/s as it saves converting to metric.