RhinoFish - 4:08 pm on Mar 25, 2013 (gmt 0)
It is more complicated than we're all saying, of course.
For exact match, for example, negs shouldn't matter.
And the QS shown is for the exact match version of your other match types, so there's data you don't see - your QS for a non-exact match.
Eliminating searches you know don't convert well enough, makes sense whether if affects QS or not.