To ensure the sweetest tasting bud possible, I would start flushing now. If not the smoke can be harsh due to the chemical content of the nutrients. Some nutes do add to the taste such as Advanced Nutrients Bud Candy. The last week or two the plant will use it's own existing nutes (hence the mentioned color change).
A day or two before chopping, water with three times the volume of the pot to flush out all the salts in the soil and leave her in the dark the last 24 hours before harvest.
I'll pray for the dankiest of the dank : )