36days Flowering: Nutrient Questions wpics

Well I am currently 36days into flowering. I have 4 plants which were all feed peters 20-20-20 biweekly during VEG. and I recently got some Fox Farm: Peace of Mind Fruit&Flower. I only fed the plants once, 3/4 the recommended dose by top dressing
The box says to feed monthly by top dressing. 1-2 ft. plants should get 1/2cup, 2-3ft gets 3/4cup,and 3-5ft gets 1 1/2cups. Anyway, plants are about 2-3 feet so i gave them a half a cup, the first week of flowering. Well its getting towards the end, and the plants look really healthy (except for one). But I wanted to know if I should go ahead and feed again????? Ive heard that you should stop all fertilizers 2 weeks or so before harvest..
THANKS IN ADVANCE

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