I always pH my nute solution... I could be incorrect but I believe that neutralizes the soil ONLY, you still wouldn't want to pour nute solution with a wicked crazy pH on your plant(s)... Example, if your soil pH is around 7.0 and you pour in some nute solution thats lets say is 4.0... even when averaged out, plus and minused, whatever math formula you use... the pH would still be off as a whole...
does that make sense?