Hey man.
You're in the endgame now
The hard bit is done on N part
Typically with the nutrients you needed to get that big. The amount needed now is much lower. You gotta change the nutrient ppm as the plant moves into a new phase. .
Low dose ppm core npk nutrients during pre fower.
Then you give more PK with some N but should be lower than you used for grow
So, cut your feed. Lower your lights power, make sure your plant has good air flow around it.
Higher PK is needed at this sage.. you aren't carrying the same ppm feed from your peak into now? If so that's your issue pal.