I don't notice the difference in taste between plants I've flushed and plants I haven't after I cure it for a bit, so I don't really flush. It seems like continuing to nute till harvest helps pack on the weight... Sometimes I'll throw a flush in like 36 hours before if I think there might be some excess nutes, but thats about it. My plants seem to use up their nutes quite well, usually around harvest time they've already used most of em up, kinda negating the need to flush.