brown leaves caused by big bud

K SO HERES THE DEAL
THE BUD SEEMED TO HAVE SLOWED DOWN IN GROWTH AND THE TOP LEAVES AROUND THE MAIN TOP BUD HAVE ALL TURNED BROWN AND CRISPY. THE LIGHT IS ABOUT 6" AWAY (NOT HOT AT ALL). I WOULD IMAGINE I OVERDOSED THE NUTES. I AM USING BIG BUD ONLY. I HAVE SINCE STOPPED USING IT AND FLUSHED THE PLANT. THE LOWER BUDS ARE TINY AND STILL GROWING WITH GREEN STEMS BUT THE UPPER STEMS ARE PURPLE. DOES ANYONE HAVE ANY IDEAS? IM THINKING IM GONNA HARVEST IN A COUPLE OF DAYS BUT THE LOWER BUDS ARE STILL BABIES. WHAT SHOULD I DO?
SOIL
CFL
6.2 PH
GOOD WATER
GOOD AIR
76 DEGREES
DAY 52 FLOWERING

if you're using Big Bud by advanced without a base nutrient feed you did burn them. BB is meant as an additive. i don't know what's going to happen but if they're dying i'd pick before it dies.

your PH is low for soil, 6.8 is perfect.