I think you might have to play it by ear. Everyone's body is different and some of us can lose by eating all of our daily PP and then the weeklies and others have to keep it at just the daily PP or below and not touch the weeklies.
So, I would say that you don't have to, but if you don't lose any weight then try to add in some power foods to hit your target and to give your metabolism a push.
BMI - 30.3
Goal #1 - 196 (10%) √ | Goal #2 - 185 | Goal #3 - 174 (20%) | Goal #4 - 165 | GOAL