I grow in soil only these days, and i really don't get any better, more, or bigger buds from feeding any longer than through about week 5, with the exception of a PK boost in like week 6 and that's it. In hydroponics, it's obviously much different as things happen much more quickly. I've fed until about 4 days before harvest and stopped mid week 5, and the best smoke for me seems to come from that schedule. I didn't notice any benefit and feeding longer, or not flushing. I think of it as just not feeding... not "flushing"