Here's one pattern of thought on flushing or not. Right up to the second of harvest, somewhere on the plant, THC is still forming. This THC is dependant on nutrients for its formation. If you deprive the plant of nutrients or lessen them for the last week or two before harvesting, you're also, IMHO, depriving the plant of the ability to form THC properly and to its best volume and potency. It's like saying to an athlete before he runs an olympic mile, I'm not going to let you eat for two days before you run. It'll clean out your system and make you run better. That sounds good, but in actuality, your runner will be a walker and lose.
The plants continue to actively grow THC right up to the second they are harvested. IMHO, that THC will of better quality and volume if the plant has ALL the nutrients it can use up to the point in which you cut it down.
Hehe, of course, that could be wrong. No one has ever done proper testing to determine the validity of the "Flushing" methods.
Pick your method and swear by it!
When I harvest, I stand on one foot while singing "Ole MacDonald". I've found that this makes the pot stronger...hehee.