Ok let me ask this in a different way...
If the airframe has a build in down thrust of negative one degree relative to the theoretical thrust line and the wing is set at positive .8 degrees relative to this line....does the airframe now have a down thrust of 1.8 degrees or is it still 1.0 degrees .
Everything is relative to the datum/thrust line.
Ask yourself this. Is the wing incidence the datum line?