I never noticed any difference, running 10k perpetual now so I can't bother even if I wanted to.
Prior to harvesting my plants, what I do is.....drool. Sometimes I rub my hands together and do a little "holy shit" dance,....sometimes I just get right to it but one thing that always remains the same,....an hour into trimming I realize what a daunting week I have ahead of me,lol
Seriously though, the only prep I do for a plant coming down is make sure she's completely flushed. I feed light, but every watering so I do straight water for the last 5-6 feeds (every other day appx)