well, from my experiences the preflowers at the top of the bud grow more than usuall, and thats not really a good thing as it takes a while for those preflowers to 'die' into good bud, i'd say its not really worth doing towards the end, unless you do it once a week throughout the flowering phase, one thing ive allways stood by is the buds mature alot more at night, providing it receives sufficient sunlight the previous day, the more i think of it the more i beleive you could be onto something, to increase yeild, its definately fair to say its a better idea then some ive read on here before lol, good luck...