Dried ends on plants

I UNDERSTAND THAT I MIGT OF OVER NEUTED MY PLANTS DUE TO THE DRIED TIPS,BUT THIS HAS ONLY HAPPENED TO TWO OF THE PLANTS,THE REST ARE OK,WHICH HAVE ALSO HAD THE SAME AMOUNT OF NEUTS.HAVE STOPPED WITH THE NEUTS AND ARE ON A WATER ONLY FOR A WEEK.JUST REPOTTED AS WELL IN TO A GOOD PEAT WHICH SAYS YOU SHOULDNT FEED FOR 4-6 WEEKS IN THAT STUFF, SO SHOULD I HOLD BACK FROM FEEDING UNTIL I GO INTO FLOWERPHOTO ATTACHED(TWO WEEKS TO GO TILL FLOWERING)